A301991 Terms of A301857 where both A301857(n) and its counterpart are composite.

185, 323, 403, 527, 551, 779, 959, 899, 1139, 1147, 1517, 1649, 1643, 1751, 1763, 1943, 2071, 2363, 2509, 2561, 2603, 2669, 2827, 2747, 2831, 2993, 3635, 3139, 3649, 3791, 3737, 3893, 4031, 4087, 4453, 4553, 5615, 4883, 4891, 5663, 5069

Offset

1,1

Comments

A301857 selects the least solutions to A023900 where a023900(j) + a023900(k) = 0 and the pair j,k are coprime.

Links

Table of n, a(n) for n=1..41.

Example

185 is a term because a301857(11) = 185 and both 185 and 273 are composite.

Crossrefs

Subsequence of A301857; cf. A023900.

Sequence in context: A129311 A252272 A247529 * A136048 A209373 A207076

Adjacent sequences: A301988 A301989 A301990 * A301992 A301993 A301994

Keyword

nonn

Author

Torlach Rush, Mar 30 2018

Status

approved