54209
domain: N
Appears in sequences
- Brilliant numbers k such that 2k+1 is also brilliant.at n=39A085649
- Numerators of the convergents in the continued fraction expansion for the constant given by A100338, where the partial quotients equal A006519 (greatest power of 2 dividing n).at n=13A100340
- Denominators of the convergents in the continued fraction expansion for the constant given by A100338, where the partial quotients equal A006519 (greatest power of 2 dividing n).at n=14A100341
- Numerators of the convergents in the continued fraction expansion for twice the constant given by A100338, where the partial quotients equal A006519 (greatest power of 2 dividing n) interleaved with 2's.at n=13A100342
- Denominators of the convergents in the continued fraction expansion for twice the constant given by A100338, where the partial quotients equal A006519 (greatest power of 2 dividing n) interleaved with 2's.at n=14A100343
- Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11110-01111 pattern in any orientation.at n=16A147511
- Alternated binomial partial sums of central Lah numbers (A187535).at n=4A187539
- G.f.: 1 + Sum_{n>=1} a(n)*x^n/(1 - x^n) = Product_{n>=1} (1 + n*x^n).at n=23A300278
- a(n) = prime(n) * prime(2n).at n=35A319613