23563

Properties

Appears in sequences

• Primes of form k^2 + k + 1.at n=44A002383
• Sum over all n! permutations of n letters of maximum cycle length.at n=6A028418
• Number of asymmetric forests with n nodes.at n=20A035056
• Discriminants of imaginary quadratic fields with class number 17 (negated).at n=35A046014
• Smallest number greater than 1 which ends in an odd digit in bases 2 through n.at n=31A064829
• Smallest number greater than 1 which ends in an odd digit in bases 2 through n.at n=32A064829
• Primes of the form 4*k^2 - 10*k + 7 with k positive.at n=26A073337
• Balanced primes of order eleven.at n=11A096703
• Primes that are a concatenation of 2, 3 and a prime.at n=19A101218
• Primes from merging of 5 successive digits in decimal expansion of Zeta(2) or (Pi^2)/6.at n=24A105378
• Quadruple lucky numbers (lower terms). Numbers n such that n, n+2, n+6, n+8 are all Lucky numbers.at n=20A139783
• a(n) = 7*a(n-1) - 9*a(n-2) + a(n-3) with a(0)=3, a(1)=7, a(2)=31.at n=6A141385
• Primes of the form (2k)^2 + 3(2k + 1)^2.at n=13A147297
• 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=25A162652
• Primes of the form ((p-1)/2)^2+((p+1)/2), where p is prime.at n=26A163418
• Primes of the form n^2 + n + 1 where n is nonprime.at n=34A185632
• The Matula number of the rooted tree obtained from the rooted tree T having Matula number n by replacing each edge of T with a path of length 2.at n=28A257538
• Twin prime pairs of the form (k^2 + k - 1, k^2 + k + 1).at n=41A265006
• Primes of the form 1 + n + n^2 + n^3 + ... + n^k, n > 1, k > 1 where n is not prime.at n=34A285017
• Binomial transform of A026007.at n=10A294502