A256350 Composites in base 10 that remain composite in exactly eight bases b, 2 <= b <= 10, expansions interpreted as decimal numbers.

4, 6, 12, 26, 27, 35, 38, 45, 46, 48, 49, 50, 52, 56, 57, 58, 63, 64, 65, 66, 68, 77, 81, 82, 84, 85, 88, 95, 105, 116, 117, 118, 119, 121, 122, 134, 136, 138, 142, 153, 154, 161, 165, 166, 171, 175, 176, 187, 188, 190, 192, 195, 207, 208, 218, 219, 220, 225

Offset

1,1

Links

Sebastian Petzelberger, Table of n, a(n) for n = 1..10000

Carlos Rivera, PP&P Puzzle 24: Primes in several bases, The Prime Puzzles & Problems Connection.

Crossrefs

Cf. A052026, A256350-A256356, A038537, A052027-A052033, A084482, A236356.

Sequence in context: A095969 A090608 A197467 * A215177 A294489 A344995

Adjacent sequences: A256347 A256348 A256349 * A256351 A256352 A256353

Keyword

nonn,base

Author

Sebastian Petzelberger, Mar 25 2015

Status

approved