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A045578 Numbers k that divide 5^k + 2^k. 1
1, 7, 49, 343, 2401, 11179, 16807, 24059, 78253, 117649, 168413, 547771, 823543, 1178891, 3834397, 5764801, 8252237, 11812969, 17852863, 23649997, 26840779, 34591207, 38422223, 40353607, 57765659, 82690783, 94527811, 124970041, 165549979, 178539809, 187885453 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..64

MATHEMATICA

Select[Range[200000], Divisible[PowerMod[2, #, #] + PowerMod[5, #, #], #] &] (* Amiram Eldar, Oct 23 2021 *)

CROSSREFS

Cf. A074600.

Sequence in context: A228439 A216130 A124536 * A126627 A206453 A000420

Adjacent sequences:  A045575 A045576 A045577 * A045579 A045580 A045581

KEYWORD

nonn

AUTHOR

David W. Wilson

EXTENSIONS

More terms from Amiram Eldar, Oct 23 2021

STATUS

approved

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Last modified December 4 15:36 EST 2021. Contains 349526 sequences. (Running on oeis4.)