40157

Appears in sequences

• Smallest m such that A051145(m) = 2^n.at n=24A051147
• Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 11.at n=25A051976
• Numbers k such that 8*10^k + 6*R_k + 3 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=16A103088
• Number of nonempty subsets of {1, 2, ..., n} with <=5 pairwise coprime elements.at n=39A187266
• Numbers n such that either prime(n-1) == -1 (mod n) or prime(n+1) == -1 (mod n) but not both.at n=34A225318
• Positions at which powers of 2 occur in A051145.at n=34A244747
• a(n) = a(n-1) + a(n-2) + 2 a(ceiling(n/2)), where a(0) = 1, a(1) = 2, a(2) = 3.at n=17A298351