18813

Appears in sequences

• Define the sequence T(a(0),a(1)) by a(n+2) is the greatest integer such that a(n+2)/a(n+1) < a(n+1)/a(n) for n >= 0. This is T(5,26).at n=5A022032
• Numbers k such that 171*2^k+1 is prime.at n=16A032462
• Discriminants of real quadratic fields with class number 1 and related continued fraction period length of 18.at n=55A050967
• Number of kites, distinct up to congruence, on an n X n grid (or geoboard).at n=37A181946
• a(n) = n^7 + 7*n + 7^n.at n=4A220528
• Numbers m such that A166133(m+1) = A166133(m)^2 - 1.at n=27A256703
• Numbers n for which the numbers 6n+1, 3n+2, 6n+7 are all odd composite squarefree numbers, but none are semiprimes.at n=29A263510