A209630 Numbers in A206853 without proper divisors > 1 from the same sequence.

1, 2, 7, 11, 13, 31, 47, 59, 61, 127, 191, 223, 239, 251, 895, 991, 1007, 1019, 1021, 2047, 3071, 3583, 3967, 4031, 4079, 4091, 4093, 8191, 15359, 16127, 16255, 16319, 16351, 16375, 16381, 49151, 63487, 65279, 65407, 65519, 65531, 131071, 196607, 229375

Offset: 1

Author

Vladimir Shevelev, Mar 13 2012

Keywords

• nonn
• base

Comments

Composite terms are 895, 1007, 2047, 3071, 4031, 16255, 16351, 16375, 49151, 65279, 65531, 196607, 229375,...

Crossrefs

Cf. A206853.