A188426 Position of 3^n in A051037 (5-smooth numbers).

1, 3, 8, 17, 31, 50, 77, 112, 157, 211, 276, 355, 448, 554, 676, 815, 973, 1149, 1344, 1561, 1801, 2064, 2351, 2663, 3003, 3371, 3766, 4190, 4647, 5135, 5657, 6212, 6802, 7430, 8094, 8797, 9539, 10322, 11147, 12014, 12925, 13881, 14883, 15933, 17031, 18178, 19375, 20624, 21925, 23281, 24690

Offset: 0

Author

Zak Seidov, Mar 31 2011

Keywords

• nonn

Links

• Zak Seidov, Table of n, a(n) for n = 0..150

Crossrefs

Cf. A051037, A188425, A188427 (powers of 2 and 5).

Formula

A051037(a(n)) = 3^n.

a(n) ~ c * n^3, where c = log(3)^2/(6*log(2)*log(5)) = 0.180317536836709... - Vaclav Kotesovec and Amiram Eldar, Sep 22 2024