A113460 Triangle read by rows: n-th row is the lexicographically earliest arithmetic progression of n numbers all having the same prime signature.

1, 2, 3, 3, 5, 7, 5, 11, 17, 23, 5, 11, 17, 23, 29, 7, 37, 67, 97, 127, 157, 7, 157, 307, 457, 607, 757, 907, 11, 1210241, 2420471, 3630701, 4840931, 6051161, 7261391, 8471621, 11, 32671181, 65342351, 98013521, 130684691, 163355861, 196027031, 228698201, 261369371

Offset

1,2

Comments

Presumably this triangle will differ from that in A130791 after some point. - N. J. A. Sloane, Sep 22 2007

Apart from the initial term, this sequence coincides with A130791 for at least the first 210 rows. - David W. Wilson, Sep 22 2007

Links

Table of n, a(n) for n=1..45.

Index entries for sequences related to primes in arithmetic progressions

Example

Triangle begins:
  1;
  2,   3;
  3,   5,   7;
  5,  11,  17,  23;
  5,  11,  17,  23,  29;
  7,  37,  67,  97, 127, 157;

Crossrefs

Cf. A113459 (leading terms).

Cf. A007918, A086786, A113459, A113461, A130791, A127781.

Sequence in context: A180611 A084127 A089934 * A113470 A086786 A211890

Adjacent sequences: A113457 A113458 A113459 * A113461 A113462 A113463

Keyword

nonn,tabl

Author

David Wasserman, Jan 08 2006

Extensions

Erroneous commas in sequence deleted by N. J. A. Sloane, Sep 22 2007

Status

approved