A158910 -id:A158910 - cp's OEIS frontend

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

Paul Curtz, Apr 01 2009

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

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

Cf. A158910.

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

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

A158908 First differences of A061238.

Original entry on oeis.org

9, 18, 18, 36, 18, 36, 36, 18, 36, 36, 18, 36, 36, 36, 54, 18, 18, 90, 18, 54, 18, 18, 144, 18, 18, 54, 18, 18, 36, 36, 72, 18, 54, 18, 36, 72, 18, 54, 72, 18, 36, 36, 36, 54, 54, 54, 90, 36, 54, 72, 54, 36, 18, 18, 54, 54, 36, 54, 36, 18, 72, 18, 18, 18, 54, 18, 72, 36, 36, 18, 18

Offset: 1

Paul Curtz, Mar 30 2009

Obviously all entries are multiples of 9.

First differences of some the 6 prime modulo classes shown in A061237 to A061241 are also in A158910 and A158955.

Edited and extended by R. J. Mathar, Apr 06 2009

cp's OEIS Frontend

A158955 First differences of A061241.

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