%I A113456
%S A113456 1,2,1,33,3,1,19940,3,2,1,204323,213,155,3,1,380480345,213,7572,3,2,1
%N A113456 Square array read by antidiagonals: a(n, d) is the smallest number that 
               begins an arithmetic progression with common difference d of n numbers 
               with the same prime signature.
%C A113456 First two columns are A034173 and A113457. First three rows are A000012, 
               A086489 and A113458.
%e A113456 a(3, 2) = 3 because 3, 5 and 7 have the same prime signature.
%Y A113456 Sequence in context: A016547 A081541 A113465 this_sequence A127608 A038022 
               A038021
%Y A113456 Adjacent sequences: A113453 A113454 A113455 this_sequence A113457 A113458 
               A113459
%K A113456 nonn,tabl,less
%O A113456 1,2
%A A113456 David Wasserman (dwasserm(AT)earthlink.net), Jan 08 2006; corrected Jan 
               08 2006.