%I #9 Mar 12 2014 16:36:52
%S 1,2,2,4,4,4,7,8,8,7,8,14,1,14,8,11,1,13,13,1,11,13,7,2,4,2,7,13,14,
%T 11,14,11,11,14,11,14
%N Antidiagonal triangular version of the modulo 15 prime multiplication table past n=3.
%C This modulo 15 of prime digit endings is important because it gives even odd prime types that appear in pairs: {1,4},{2,13},{7,8},{11,14}
%F b[n]={1, 2, 4, 7, 8, 11, 13, 14} T[n,m]=Mod[b[n]*b[m],15] a(n) = T[n,m]: antidiagonal form
%e Array looks like:
%e 1, 2, 4, 7, 8, 11, 13, 14
%e 2, 4, 8, 14, 1, 7, 11, 13
%e 4, 8, 1, 13, 2, 14, 7, 11
%e 7, 14, 13, 4, 11, 2, 1, 8
%e 8, 1, 2, 11, 4, 13, 14, 7
%e 11, 7, 14, 2, 13, 1, 8, 4
%e 13, 11, 7, 1, 14, 8, 4, 2
%e 14, 13, 11, 8, 7, 4, 2, 1
%t Table[Mod[Prime[n], 15], {n, 1, 50}] a = {1, 2, 4, 7, 8, 11, 13, 14} b = Table[Mod[a[[n]]*a[[m]], 15], {n, 1, 8}, {m, 1, 8}] c = Table[Table[b[[n, l - n]], {n, 1, l - 1}], {l, 1, Dimensions[b][[1]] + 1}] Flatten[c]
%K nonn,tabf,fini
%O 0,2
%A _Roger L. Bagula_, Jun 23 2006