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

1,2

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?

Links

Table of n, a(n) for n=1..32.

Formula

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

Crossrefs

Cf. A000215, A000225, A004185, A078726.

Sequence in context: A346296 A332374 A152677 * A253582 A117589 A295930

Adjacent sequences: A135371 A135372 A135373 * A135375 A135376 A135377

Keyword

base,nonn

Author

Jonathan Vos Post, Dec 09 2007

Extensions

Offset corrected by Arkadiusz Wesolowski, Jun 02 2011

Status

approved