20023

Properties

Appears in sequences

• Primes of form k^2 + k + 1.at n=40A002383
• n written in fractional base 4/2.at n=39A024630
• Primes whose sum of digits is 7.at n=41A062337
• Primes of the form 4*k^2 - 10*k + 7 with k positive.at n=23A073337
• Class 6+ primes.at n=24A081634
• Primes of the form 1 + n + n^2 + n^3 + ... + n^k, n > 1, k > 1.at n=43A085104
• Primes congruent to 22 mod 59.at n=35A142749
• Primes congruent to 15 mod 61.at n=37A142813
• Primes of the form (2k)^2 + 3(2k + 1)^2.at n=12A147297
• Primes p of the form : p+p^2+p^3-+8=prime.at n=17A154823
• Primes p such that there are positive integers m and n and a prime q such that p = m^2+m-q = n^2+n+q.at n=24A162652
• Primes of the form ((p-1)/2)^2+((p+1)/2), where p is prime.at n=25A163418
• Numbers n such that 10^n - 63 is prime.at n=16A178433
• Primes of the form n^2 + n + 1 where n is nonprime.at n=30A185632
• Primes of the form n^2 + n + 1, where n is semiprime.at n=12A193144
• Number of nondecreasing sequences of n 1..6 integers with no element dividing the sequence sum.at n=32A212866
• Least prime p such that the factorization of p^2-9 contains n consecutive primes beginning with prime(3)=5.at n=4A214149
• Least prime p such that the factorization of p^2-9 contains n consecutive primes beginning with prime(3)=5.at n=5A214149
• Number of n X 3 arrays of the minimum value of corresponding elements and their horizontal, vertical or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..1 n X 3 array.at n=25A219699
• Primes p such that p + 4, p + 16, p + 64, p + 256 and p + 1024 are all semiprimes.at n=21A241493