3000 (number)

3001 to 3099

• 3001 – super-prime; divides the Euclid number 2999# + 1
• 3003 – triangular number, only number known to appear eight times in Pascal's triangle; no number is known to appear more than eight times other than 1. (see Singmaster's conjecture)
• 3019 – super-prime, happy prime
• 3023 – 84th Sophie Germain prime, 51st safe prime
• 3025 = 55², sum of the cubes of the first ten integers, centered octagonal number,^[1] dodecagonal number^[2]
• 3037 – star number, cousin prime with 3041
• 3045 – sum of the integers 196 to 210 and sum of the integers 211 to 224
• 3046 – centered heptagonal number^[3]
• 3052 – decagonal number^[4]
• 3059 – centered cube number^[5]
• 3061 – prime of the form 2p-1
• 3063 – perfect totient number^[6]
• 3067 – super-prime
• 3071 – Thabit number
• 3072 – 3-smooth number (2¹⁰×3)
• 3075 – nonagonal number^[7]
• 3078 – 18th pentagonal pyramidal number^[8]
• 3080 – pronic number
• 3081 – triangular number, 497th sphenic number
• 3087 – sum of first 40 primes

3100 to 3199

• 3109 – super-prime
• 3119 – safe prime
• 3121 – centered square number,^[9] emirp, largest minimal prime in quinary.
• 3125 – a solution to the expression ${\displaystyle n^{n}}$, where ${\displaystyle n=5}$ (${\displaystyle 3125=5^{5}}$).
• 3136 = 56², palindromic in ternary (11022011₃), tribonacci number^[10]
• 3137 – Proth prime,^[11] both a left- and right-truncatable prime
• 3149 – highly cototient number^[12]
• 3150 = 15³ - 15²
• 3155 – member of the Mian–Chowla sequence^[13]
• 3159 = number of trees with 14 unlabeled nodes^[14]
• 3160 – triangular number
• 3167 – safe prime
• 3169 – super-prime, Cuban prime of the form ${\displaystyle x=y+1}$.^[15]
• 3192 – pronic number

3200 to 3299

• 3203 – safe prime
• 3207 – number of compositions of 14 whose run-lengths are either weakly increasing or weakly decreasing^[16]
• 3229 – super-prime
• 3240 – triangular number
• 3248 – member of a Ruth-Aaron pair with 3249 under second definition, largest number whose factorial is less than 10¹⁰⁰⁰⁰ – hence its factorial is the largest certain advanced computer programs can handle.
• 3249 = 57², palindromic in base 7 (12321₇), centered octagonal number,^[1] member of a Ruth–Aaron pair with 3248 under second definition
• 3253 – sum of eleven consecutive primes (269 + 271 + 277 + 281 + 283 + 293 + 307 + 311 + 313 + 317 + 331)
• 3256 – centered heptagonal number^[3]
• 3259 – super-prime, completes the ninth prime quadruplet set
• 3264 – solution to Steiner's conic problem: number of smooth conics tangent to 5 given conics in general position^[17]
• 3266 – sum of first 41 primes, 523rd sphenic number
• 3276 – tetrahedral number^[18]
• 3277 – 5th super-Poulet number,^[19] decagonal number^[4]
• 3279 – first composite Wieferich number
• 3281 – octahedral number,^[20] centered square number^[9]
• 3286 – nonagonal number^[7]
• 3299 – 85th Sophie Germain prime, super-prime

3300 to 3399

• 3306 – pronic number
• 3307 – balanced prime^[21]
• 3313 – balanced prime, star number^[21]
• 3319 – super-prime, happy number
• 3321 – triangular number
• 3329 – 86th Sophie Germain prime, Proth prime,^[11] member of the Padovan sequence^[22]
• 3354 – member of the Mian–Chowla sequence^[13]
• 3358 – sum of the squares of the first eleven primes
• 3359 – 87th Sophie Germain prime, highly cototient number^[12]
• 3360 – largely composite number^[23]
• 3363/2378 ≈ √2
• 3364 = 58²
• 3367 = 15³ - 2³ = 16³ - 9³ = 34³ - 33^{3[importance?]}
• 3375 = 15³, palindromic in base 14 (1331₁₄), 15th cube
• 3389 – 88th Sophie Germain prime

3400 to 3499

• 3403 – triangular number
• 3407 – super-prime
• 3413 – 89th Sophie Germain prime, sum of the first 5 nⁿ: 3413 = 1¹ + 2² + 3³ + 4⁴ + 5⁵
• 3422 – pronic number, 553rd sphenic number, melting point of tungsten in degrees Celsius
• 3435 – a perfect digit-to-digit invariant, equal to the sum of its digits to their own powers (3³ + 4⁴ + 3³ + 5⁵ = 3435)
• 3439 – magic constant of n×n normal magic square and n-queens problem for n = 19.
• 3445 – centered square number^[9]
• 3447 – sum of first 42 primes
• 3449 – 90th Sophie Germain prime
• 3456 – 3-smooth number (2⁷×3³)
• 3457 – Proth prime^[11]
• 3463 – happy number
• 3467 – safe prime
• 3469 – super-prime, Cuban prime of the form x = y + 2, completes the tenth prime quadruplet set^[24]
• 3473 – centered heptagonal number^[3]
• 3481 = 59², centered octagonal number^[1]
• 3486 – triangular number
• 3491 – 91st Sophie Germain prime

3500 to 3599

• 3504 – nonagonal number^[7]
• 3510 – decagonal number^[4]
• 3511 – largest known Wieferich prime
• 3512 – number of primes ${\displaystyle \leq 2^{15}}$.^[25]
• 3517 – super-prime, sum of nine consecutive primes (367 + 373 + 379 + 383 + 389 + 397 + 401 + 409 + 419)
• 3539 – 92nd Sophie Germain prime
• 3540 – pronic number
• 3559 – super-prime
• 3569 – highly cototient number^[12]
• 3570 – triangular number
• 3571 – 500th prime, Cuban prime of the form x = y + 1,^[15] 17th Lucas number,^[26] 4th balanced prime of order 4.^[27]
• 3591 – member of the Mian–Chowla sequence^[13]
• 3593 – 93rd Sophie Germain prime, super-prime

3600 to 3699

• 3600 = 60², number of seconds in an hour, called šār or šāru in the sexagesimal system of Ancient Mesopotamia (cf. Saros), 1201-gonal number
• 3601 – star number
• 3610 – 19th pentagonal pyramidal number^[8]
• 3613 – centered square number^[9]
• 3617 – sum of eleven consecutive primes (293 + 307 + 311 + 313 + 317 + 331 + 337 + 347 + 349 + 353 + 359)
• 3623 – 94th Sophie Germain prime, safe prime
• 3637 – balanced prime, super-prime^[21]
• 3638 – sum of first 43 primes, 599th sphenic number
• 3643 – happy number, sum of seven consecutive primes (499 + 503 + 509 + 521 + 523 + 541 + 547)
• 3654 – tetrahedral number^[18]
• 3655 – triangular number, 601st sphenic number
• 3660 – pronic number
• 3684 – 13th Keith number^[28]
• 3697 – centered heptagonal number^[3]

3700 to 3799

• 3721 = 61², centered octagonal number^[1]
• 3729 – nonagonal number^[7]
• 3733 – balanced prime, super-prime^[21]
• 3741 – triangular number, 618th sphenic number
• 3751 – decagonal number^[4]
• 3761 – 95th Sophie Germain prime, super-prime
• 3779 – 96th Sophie Germain prime, safe prime
• 3780 – largely composite number^[23]
• 3782 – pronic number, 623rd sphenic number
• 3785 – centered square number^[9]
• 3797 – member of the Mian–Chowla sequence,^[13] both a left- and right- truncatable prime

3800 to 3899

• 3803 – 97th Sophie Germain prime, safe prime, the largest prime factor of 123,456,789
• 3821 – 98th Sophie Germain prime
• 3828 – triangular number
• 3831 – sum of first 44 primes
• 3840 = 16³ - 16², double factorial of 10
• 3844 = 62²
• 3851 – 99th Sophie Germain prime
• 3856 – number of 17-bead binary necklaces with beads of 2 colors where the colors may be swapped but turning over is not allowed^[29]
• 3863 – 100th Sophie Germain prime
• 3865 – greater of third pair of Smith brothers
• 3888 – longest number when expressed in Roman numerals I, V, X, L, C, D, and M (MMMDCCCLXXXVIII), 3-smooth number (2⁴×3⁵)
• 3889 – Cuban prime of the form x = y + 2^[24]
• 3894 – octahedral number^[20]

3900 to 3999

• 3901 – star number
• 3906 – pronic number
• 3911 – 101st Sophie Germain prime, super-prime
• 3914 – number of 18-bead necklaces (turning over is allowed) where complements are equivalent^[30]
• 3916 – triangular number
• 3925 – centered cube number^[5]
• 3926 – 12th open meandric number, 654th sphenic number
• 3928 – centered heptagonal number^[3]
• 3937 – product of distinct Mersenne primes,^[31] repeated sum of divisors is prime,^[32] denominator of conversion factor from meter to US survey foot^[33]
• 3940 – there are 3940 distinct ways to arrange the 12 flat pentacubes (or 3-D pentominoes) into a 3x4x5 box (not counting rotations and reflections)
• 3943 – super-prime
• 3947 – safe prime
• 3960 – largely composite number^[23]
• 3961 – nonagonal number,^[7] centered square number^[9]
• 3969 = 63², centered octagonal number^[1]
• 3989 – highly cototient number^[12]
• 3998 – member of the Mian–Chowla sequence^[13]
• 3999 – largest number properly expressible using Roman numerals I, V, X, L, C, D, and M (MMMCMXCIX), ignoring vinculum

Prime numbers

There are 120 prime numbers between 3000 and 4000:^[34][35]

3001, 3011, 3019, 3023, 3037, 3041, 3049, 3061, 3067, 3079, 3083, 3089, 3109, 3119, 3121, 3137, 3163, 3167, 3169, 3181, 3187, 3191, 3203, 3209, 3217, 3221, 3229, 3251, 3253, 3257, 3259, 3271, 3299, 3301, 3307, 3313, 3319, 3323, 3329, 3331, 3343, 3347, 3359, 3361, 3371, 3373, 3389, 3391, 3407, 3413, 3433, 3449, 3457, 3461, 3463, 3467, 3469, 3491, 3499, 3511, 3517, 3527, 3529, 3533, 3539, 3541, 3547, 3557, 3559, 3571, 3581, 3583, 3593, 3607, 3613, 3617, 3623, 3631, 3637, 3643, 3659, 3671, 3673, 3677, 3691, 3697, 3701, 3709, 3719, 3727, 3733, 3739, 3761, 3767, 3769, 3779, 3793, 3797, 3803, 3821, 3823, 3833, 3847, 3851, 3853, 3863, 3877, 3881, 3889, 3907, 3911, 3917, 3919, 3923, 3929, 3931, 3943, 3947, 3967, 3989