A163638 Two copies of the sequence A141468, one at prime the other at nonprime indices.

0, 1, 0, 1, 4, 4, 6, 6, 8, 9, 10, 8, 12, 9, 14, 15, 16, 10, 18, 12, 20, 21, 22, 14, 24, 25, 26, 27, 28, 15, 30, 16, 32, 33, 34, 35, 36, 18, 38, 39, 40, 20, 42, 21, 44, 45, 46, 22, 48, 49, 50, 51, 52, 24, 54, 55, 56, 57, 58, 25, 60, 26, 62, 63, 64, 65, 66, 27, 68, 69, 70, 28, 72, 30, 74, 75

Offset

0,5

Comments

The indices of this sequence are labeled as 0=N, 1=N, 2=P, 3=P, 4=N, 5=P, 6=N, etc. N=nonprime or P=prime. The numbers 0,1,4,6,8, etc. of A141468 are filled in once at consecutive positions marked N, and a second time at the positions marked P.

Links

Table of n, a(n) for n=0..75.

Crossrefs

Cf. A000040, A001477, A141468.

Sequence in context: A190303 A175123 A276679 * A113523 A179278 A365216

Adjacent sequences: A163635 A163636 A163637 * A163639 A163640 A163641

Keyword

nonn,less

Author

Juri-Stepan Gerasimov, Aug 02 2009

Extensions

Entries checked by R. J. Mathar, Aug 06 2009

Status

approved