18535
domain: N
Appears in sequences
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 15 ones.at n=23A031783
- Numbers k such that 70*R_k + 9 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=8A056693
- a(n) = (2(n+1)(2n+1)-1) * a(n-1) + 2n(2n-1) * a(n-2), a(0) = 1, a(1) = 11.at n=3A206532
- Partial sums of A009927.at n=15A265038
- G.f.: Product_{k>=1} (1 + x^k) / (1 - x^(k*(k+1)/2)).at n=34A280422
- Inverse Moebius transform of A000056.at n=27A350156
- The indices where A354606(n) = 1.at n=33A355606