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A161142 Numbers which can be expressed as the product of numbers made of only fours. 7
1, 4, 16, 44, 64, 176, 256, 444, 704, 1024, 1776, 1936, 2816, 4096, 4444, 7104, 7744, 11264, 16384, 17776, 19536, 28416, 30976, 44444, 45056, 65536, 71104, 78144, 85184, 113664, 123904, 177776, 180224, 195536, 197136, 262144, 284416, 312576 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

64 = 4 * 4 * 4; 1936 = 44 * 44; 1776 = 4 * 444.

LINKS

Table of n, a(n) for n=1..38.

CROSSREFS

Cf. A084034, A161140, A161141, A161143, A161144, A161145, A161146, A161147.

Sequence in context: A034131 A183536 A320100 * A259013 A212960 A217873

Adjacent sequences:  A161139 A161140 A161141 * A161143 A161144 A161145

KEYWORD

nonn,base

AUTHOR

Claudio Meller, Jun 03 2009

EXTENSIONS

Corrected and extended by Claudio Meller, Jun 06 2009

Corrected and extended by Claudio Meller, Jun 27 2009

1 added by N. J. A. Sloane, Dec 04 2017

STATUS

approved

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Last modified October 19 04:40 EDT 2019. Contains 328211 sequences. (Running on oeis4.)