A135374 Mersenne numbers with digits sorted in increasing order and zeros suppressed.

1, 3, 7, 15, 13, 36, 127, 255, 115, 123, 247, 459, 1189, 13368, 23677, 35556, 11137, 122346, 224578, 145578, 112579, 133449, 367888, 11256777, 13334455, 1366788, 112234777, 234455568, 11356789, 112334778, 1234446778, 2244567999

Offset: 1

Author

Jonathan Vos Post, Dec 09 2007

Keywords

• base
• nonn

Comments

This is to A000225 as A078726 is to A000215. a(n) is prime for n = 2, 3, 5, 7, 15, 27, 29 and which other values?

Crossrefs

Cf. A000215, A000225, A004185, A078726.

Formula

a(n) = A004185(2^n - 1) = 2^n - 1, base 10, with digits sorted in increasing order and zeros suppressed.

Extensions

Offset corrected by Arkadiusz Wesolowski, Jun 02 2011