- 4000 (number)
4000 (four thousand) is the
natural number following 3999 and preceding 4001. It is adecagonal number .Selected numbers in the range 4001-4999
* 4005 -
triangular number
* 4007 -safe prime
* 4010 -magic constant of "n"×"n" normalmagic square and n-Queens Problem for "n" = 20.
* 4013 -balanced prime
* 4019 -Sophie Germain prime
* 4028 - sum of the first 45 primes
* 4030 - 3rdweird number
* 4031 - sum of the cubes of the first six primes
* 4033 - 6thsuper-Poulet number ;strong pseudoprime in base 2
* 4060 -tetrahedral number
* 4073 - Sophie Germain prime
* 4079 - safe prime
* 4095 - triangular number, the largest one of the form 2^k - 1
* 4096 -power of two 2^{12}; 64^2; 16th cube; smallest number with exactly 13 divisors; asuperperfect number
* 4104 - 2^3 + 16^3 = 9^3 + 15^3 (taxicab number )
* 4127 - safe prime
* 4139 - safe prime
* 4140 -Bell number
* 4166 -centered heptagonal number , 7!-6!-5!-4!-3!-2!-1!-0!
* 4167 - 7!-6!-5!-4!-3!-2!-1!
* 4168 - 7!-6!-5!-4!-3!-2!
* 4170 - 7!-6!-5!-4!-3!
* 4176 - 7!-6!-5!-4!
* 4181 -Fibonacci number ,Markov number
* 4186 - triangular number
* 4187 - factor of R13. Also record number of wickets taken infirst-class cricket byWilfred Rhodes .
* 4199 -highly cototient number
* 4200 -nonagonal number ,pentagonal pyramidal number , 7!-6!-5!
* 4210 - 11thsemi-meandric number
* 4211 - Sophie Germain prime
* 4219 -cuban prime of the form x = y + 1
* 4223 -Kynea number
* 4225 - 65^2,centered octagonal number
* 4227 - sum of the first 46 primes
* 4240 -Leyland number
* 4257 - decagonal number
* 4259 - safe prime
* 4271 - Sophie Germain prime
* 4278 - triangular number
* 4283 - safe prime
* 4289 - highly cototient number
* 4320 - 7!-6!
* 4324 - 23rdsquare pyramidal number
* 4349 - Sophie Germain prime
* 4351 - 9* 483.444...
* 4356 - 66^2, sum of the cubes of the first eleven integers
* 4359 -perfect totient number
* 4369 - 7thsuper-Poulet number
* 4371 - triangular number
* 4373 - Sophie Germain prime
* 4375 - perfect totient number (the smallest not divisible by 3)
* 4391 - Sophie Germain prime
* 4397 - Year ofComet Hale-Bopp 's return, a prime number
* 4400 - the number of missing persons in the sci-fi show "The 4400 "
* 4409 - Sophie Germain prime, highly cototient number, balanced prime
* 4411 - centered heptagonal number
* 4421 -alternating factorial
* 4438 - sum of the first 47 primes
* 4446 - nonagonal number
* 4447 -cuban prime of the form x = y + 1
* 4457 - balanced prime
* 4465 - triangular number
* 4481 - Sophie Germain prime
* 4489 - 67^2, centered octagonal number
* 4495 -tetrahedral number
* 4503 - largest number not the sum of four or fewer squares of composites
* 4505 - 5thZeisel number
* 4522 - decagonal number
* 4547 - safe prime
* 4560 - triangular number
* 4579 -octahedral number
* 4597 - balanced prime
* 4607 -Woodall number
* 4619 - highly cototient number
* 4620 - the number appearing on allcheques in the Check Game (aka Blank Check) on the U.S.TV game show "The Price Is Right "
* 4624 - 68^2
* 4641 -magic constant of "n"×"n" normalmagic square and n-Queens Problem for "n" = 21.
* 4656 - triangular number
* 4657 - balanced prime
* 4661 - sum of the first 48 primes
* 4663 - centered heptagonal number
* 4679 - safe prime
* 4681 - 8thsuper-Poulet number
* 4691 - balanced prime
* 4699 - nonagonal number
* 4703 - safe prime
* 4705 - 48^2 + 49^2 = 17^2 + 18^2 + cdots + 26^2
* 4727 - sum of the squares of the first twelve primes
* 4733 - Sophie Germain prime
* 4753 - triangular number
* 4761 - 69^2, centered octagonal number
* 4787 - safe prime
* 4788 - 14thKeith number
* 4793 - Sophie Germain prime
* 4795 - decagonal number
* 4799 - safe prime
* 4801 -cuban prime of the form x = y + 2, smallest prime with a composite sum of digits in base 7
* 4851 - triangular number,pentagonal pyramidal number
* 4862 -Catalan number
* 4871 - Sophie Germain prime
* 4879 - 11thKaprekar number
* 4888 - sum of the first 49 primes
* 4900 - 70^2, the only square-pyramidal square other than 1 [http://mathworld.wolfram.com/CannonballProblem.html]
* 4913 - 17th cube
* 4919 - Sophie Germain prime, safe prime
* 4922 - centered heptagonal number
* 4941 -centered cube number
* 4943 - Sophie Germain prime
* 4950 - triangular number, 12thKaprekar number
* 4959 - nonagonal number
* 4960 -tetrahedral number ; greater of 4th pair of Smith brothers
* 4991 -Lucas-Carmichael number
* 4993 - balanced prime
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