%I #7 May 19 2018 09:15:46

%S 18,18,18,54,18,18,18,72,18,36,18,36,36,18,18,72,18,54,36,18,36,90,18,

%T 36,90,54,36,36,18,18,54,90,36,54,18,18,54,36,18,54,18,54,18,36,90,36,

%U 54,36,54,36,18,18,54,36,72,18,108,36,36,72,18,18,126,36,54,54,54,36,126

%N First Differences of A061240.

%C Since A061240 contains prime numbers of the form 9k+5, k even, all numbers here are multiples of 18.

%H Harvey P. Dale, <a href="/A158910/b158910.txt">Table of n, a(n) for n = 1..1000</a>

%t Differences[Select[Prime[Range[500]],Mod[#,9]==5&]] (* _Harvey P. Dale_, May 19 2018 *)

%Y Cf. A008600.

%K nonn,less

%O 1,1

%A _Paul Curtz_, Mar 30 2009

%E Edited and extended by _R. J. Mathar_, Apr 03 2009