A023404 If any power of 2 ends with k 4's and 7's, they must be the first k terms of this sequence in reverse order.

4, 4, 7, 7, 4, 4, 4, 4, 4, 4, 7, 4, 4, 4, 4, 7, 7, 4, 7, 7, 7, 4, 7, 4, 4, 7, 4, 7, 4, 4, 7, 7, 4, 4, 7, 4, 7, 7, 4, 4, 4, 4, 4, 4, 7, 4, 7, 4, 4, 4, 4, 4, 7, 4, 7, 4, 4, 7, 7, 4, 4, 4, 7, 4, 7, 7, 4, 4, 4, 7, 7, 4, 7, 4, 4, 7, 4, 7, 7, 7, 7, 7, 4, 7, 7, 7, 7, 7, 7, 7, 4, 4, 4, 4, 4, 7, 4, 7, 4, 7, 7, 4, 7, 7, 7, 4, 4, 4

Offset

1,1

Links

Ray Chandler, Table of n, a(n) for n = 1..10000

Crossrefs

Sequence in context: A237708 A342819 A016711 * A140245 A200364 A147814

Adjacent sequences: A023401 A023402 A023403 * A023405 A023406 A023407

Keyword

nonn,base

Author

David W. Wilson

Status

approved