A253085 a(n) = A247649(A247647(n)).

5, 7, 17, 19, 19, 31, 25, 61, 71, 41, 71, 77, 71, 91, 77, 107, 121, 85, 113, 103, 217, 251, 125, 251, 281, 121, 185, 151, 251, 289, 151, 281, 307, 251, 335, 281, 311, 349, 289, 373, 307, 383, 445, 247, 445, 487, 289, 397, 331, 389, 439, 331, 463, 409, 773, 895, 457, 895, 997, 349

Offset: 1

Author

N. J. A. Sloane, Feb 06 2015

Keywords

• nonn

Comments

The terms of A247649 are products of terms from this subsequence.

It would be nice to have a characterization of this sequence that is independent of A247649.

Links

• Index entries for sequences related to cellular automata

Crossrefs

Cf, A247647, A247648, A247649.