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A045584

Numbers k that divide 4^k + 3^k.

1, 7, 49, 343, 2401, 2653, 16807, 18571, 117649, 129997, 823543, 909979, 1005487, 4941601, 5764801, 6369853, 7038409, 34591207, 40353607, 44588971, 49268863, 236474833, 242138449, 282475249, 312122797, 344882041, 381079573, 1655323831, 1694969143, 1872866779, 1977326743

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..31.

MATHEMATICA

Select[Range[10^6], Divisible[PowerMod[3, #, #] + PowerMod[4, #, #], #] &] (* Amiram Eldar, Oct 23 2021 *)

PROG

(Python)

from itertools import islice, count

def A045584_gen(startvalue=1): # generator of terms >= startvalue

kstart = max(startvalue, 1)