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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.
4
1, 2, 1, 33, 3, 1, 19940, 3, 2, 1, 204323, 213, 155, 3, 1, 380480345, 213, 7572, 3, 2, 1
OFFSET
1,2
COMMENTS
First two columns are A034173 and A113457. First three rows are A000012, A086489 and A113458.
EXAMPLE
a(3, 2) = 3 because 3, 5 and 7 have the same prime signature.
CROSSREFS
Sequence in context: A344105 A323751 A113465 * A205445 A127608 A038022
KEYWORD
nonn,tabl,less
AUTHOR
David Wasserman, Jan 08 2006; corrected Jan 08 2006
STATUS
approved