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

Author

Juri-Stepan Gerasimov, Aug 02 2009

Keywords

• nonn
• less

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.

Crossrefs

Cf. A000040, A001477, A141468.

Extensions

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