A015898 Numbers k such that k | 9^k + 9.

1, 2, 3, 6, 9, 10, 18, 30, 90, 123, 730, 7086, 172426, 300243, 372390, 449674, 1812298, 5027914, 5307130, 17214354, 20788426, 84929451, 101992426, 102177370, 103544442, 106494770, 161388338, 181327546, 193710249, 207083626

Offset: 1

Author

Robert G. Wilson v

Keywords

• nonn

Links

• Giovanni Resta, Table of n, a(n) for n = 1..100

Crossrefs

Cf. A006517, A015888, A015889, A015891, A015892, A015893, A015897, A015902, A015903, A015904, A015905, A015906.

Programs

Mathematica

Select[Range[10^5], Mod[PowerMod[9, #, #] + 9, #] == 0 &] (* Giovanni Resta, Oct 23 2018 *)

Extensions

Missing a(2)-a(4) from Giovanni Resta, Oct 23 2018