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A119496 Numbers n such that 2^n, 3^n, 5^n and 7^n have even digit sum. 0
15, 64, 83, 90, 106, 107, 120, 122, 135, 168, 173, 180, 181, 185, 193, 198, 222, 229, 239, 242, 289, 299, 347, 356, 364, 369, 407, 424, 447, 458, 462, 470, 479, 481, 503, 542, 552, 568, 580, 583, 607, 612, 648, 657, 676, 683, 684, 688, 742, 758, 787 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..51.

EXAMPLE

{2^15,3^15,5^15,7^15}={32768,14348907,30517578125,4747561509943} with even digit sum {26,36,44,64}.

PROG

(PARI) isok(n) = !(sumdigits(2^n) % 2) && !(sumdigits(3^n) % 2) && !(sumdigits(5^n) % 2) && !(sumdigits(7^n) % 2); \\ Michel Marcus, Oct 10 2013

CROSSREFS

Subsequence of A118734 and of A118867.

Sequence in context: A135972 A138104 A152099 * A044153 A044534 A063483

Adjacent sequences:  A119493 A119494 A119495 * A119497 A119498 A119499

KEYWORD

base,nonn

AUTHOR

Zak Seidov, May 26 2006

STATUS

approved

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Last modified October 26 22:19 EDT 2021. Contains 348269 sequences. (Running on oeis4.)