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A023404 If any power of 2 ends with k 4's and 7's, they must be the first k elements of this sequence in reverse order. 2
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..107.

CROSSREFS

Sequence in context: A204008 A237708 A016711 * A140245 A200364 A147814

Adjacent sequences:  A023401 A023402 A023403 * A023405 A023406 A023407

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified April 25 18:12 EDT 2019. Contains 322461 sequences. (Running on oeis4.)