51157

Properties

Appears in sequences

• Number of planted binary phylogenetic trees with n labels.at n=6A006677
• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 50.at n=3A031638
• Primes p such that x^49 = 2 has no solution mod p, but x^7 = 2 has a solution mod p.at n=17A059667
• Take A000040, omit commas: 23571113171923..., select 5-digit primes seen when scanning from left.at n=15A073038
• Determinant of M(n), the n X n matrix defined by m(i,i) = 1, m(i,j) = i-j.at n=28A079034
• Quadruple lucky numbers (lower terms). Numbers n such that n, n+2, n+6, n+8 are all Lucky numbers.at n=35A139783
• Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any horizontal or vertical neighbor, and containing the value n(n+1)/2-3.at n=6A211906
• T(n,k)=Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any horizontal or vertical neighbor, and containing the value n(n+1)/2-k-1.at n=34A211910
• Primes p such that p+12, p+1234 and p+123456 are also prime.at n=19A236304
• Primes of the form n^2 + 81.at n=21A256775
• Primes having only {1, 5, 7} as digits.at n=39A260828
• Positions of records in A205561.at n=38A378189
• Prime numbersat n=5235