Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #8 Apr 18 2013 02:48:02
%S 3,4,5,6,7,8,9,10,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,
%T 36,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,
%U 77,78,79,80,81,82,83,84,85,86
%N Rows 2, 4, 6 of Mendeleyev-Seaborg (extended to 32 columns) periodic table elements.
%C 58 terms. Companion of A137904(60 terms). Both "well" ordered give 118 terms sequence (increasing) 1 to 118;19-10=9, 55-36=19, a(n) differences lead to difference 3 before a(0)=3. Hence neutral element 0.
%Y Cf. A134984, A135559.
%K nonn,fini,full
%O 0,1
%A _Paul Curtz_, Apr 30 2008