A025714 Index of 6^n within sequence of numbers of form 4^i*6^j.

1, 3, 6, 10, 16, 23, 31, 41, 52, 64, 77, 92, 108, 125, 144, 164, 185, 207, 231, 256, 282, 310, 339, 369, 401, 434, 468, 503, 540, 578, 617, 658, 700, 743, 787, 833, 880, 928, 978, 1029, 1081, 1134, 1189, 1245, 1302, 1361, 1421, 1482, 1545, 1609, 1674, 1740, 1808

Offset

1,2

Links

Table of n, a(n) for n=1..53.

Prog

(PARI) a(n)=my(N=1); n+1+sum(i=1, n, logint(N*=6, 4)); \\ Charles R Greathouse IV, Jan 16 2018
(PARI) first(n)=my(s, N=1/6); vector(n+1, i, s+=logint(N*=6, 4)+1) \\ Charles R Greathouse IV, Jan 16 2018

Crossrefs

Differs from A025729 at a(65).

Sequence in context: A025701 A025744 A180746 * A025729 A011913 A024531

Adjacent sequences: A025711 A025712 A025713 * A025715 A025716 A025717

Keyword

nonn

Author

David W. Wilson

Status

approved