A045578 - OEIS

A045578

Numbers k that divide 5^k + 2^k.

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