A158908 - OEIS

%I #3 Mar 30 2012 18:52:03

%S 9,18,18,36,18,36,36,18,36,36,18,36,36,36,54,18,18,90,18,54,18,18,144,

%T 18,18,54,18,18,36,36,72,18,54,18,36,72,18,54,72,18,36,36,36,54,54,54,

%U 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

%N First differences of A061238.

%C Obviously all entries are multiples of 9.

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

%K nonn,less

%O 1,1

%A _Paul Curtz_, Mar 30 2009

%E Edited and extended by _R. J. Mathar_, Apr 06 2009