A015888 Numbers k such that k | (3^k + 3).

1, 2, 3, 4, 6, 12, 15, 28, 366, 435, 532, 804, 1036, 4636, 6364, 7932, 11476, 15051, 19684, 40132, 75396, 80956, 247395, 266476, 280756, 307396, 356644, 490372, 531444, 544348, 557956, 565516, 572716, 808228, 1007574, 1256356, 1695484

Offset: 1

Author

Robert G. Wilson v

Keywords

• nonn

Links

• Giovanni Resta, Table of n, a(n) for n = 1..400

Crossrefs

Cf. A006517, A015889, A015891, A015892, A015893, A015897, A015898, A015902, A015903, A015904, A015905, A015906.

Programs

Mathematica

Join[{1,2},Select[Range[17*10^5],PowerMod[3,#,#]==#-3&]] (* Harvey P. Dale, Mar 31 2024 *)

Extensions

Terms 1, 2 inserted by Max Alekseyev, Nov 24 2017