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.

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.

Links

Table of n, a(n) for n=1..21.

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

Adjacent sequences: A113453 A113454 A113455 * A113457 A113458 A113459

Keyword

nonn,tabl,less

Author

David Wasserman, Jan 08 2006; corrected Jan 08 2006

Status

approved