A158955 First differences of A061241.

36, 18, 18, 18, 54, 72, 18, 36, 36, 18, 18, 18, 54, 18, 18, 90, 54, 18, 54, 18, 18, 18, 126, 54, 90, 36, 18, 18, 18, 36, 90, 18, 18, 54, 18, 108, 18, 36, 126, 18, 36, 36, 54, 36, 72, 18, 54, 18, 36, 126, 18, 72, 18, 18, 54, 18, 36, 36, 54, 36, 144, 54, 18, 18, 90, 36, 18, 36, 162, 18

Offset: 1

Author

Paul Curtz, Apr 01 2009

Keywords

• nonn
• less

Comments

Six prime modulo classes are A061237, A061238, A061239, A061240, A061241 and A061242

with remainders 1, 2, 4, 5, 7, and 8 (mod 9).

Crossrefs

Cf. A158910.

Programs

Mathematica

Differences[Select[Prime[Range[500]],Mod[#,9]==7&]] (* Harvey P. Dale, Oct 13 2022 *)

Extensions

Edited and extended by R. J. Mathar, Apr 04 2009