A065223 Fill a triangular array by rows by writing numbers 1 up to b(0), 1 up to b(1), etc., where b(n) are the heptagonal numbers (A000566). The final elements of the rows form a(n).

1, 2, 5, 2, 7, 13, 2, 10, 19, 29, 6, 18, 31, 45, 5, 21, 38, 56, 75, 14, 35, 57, 80, 104, 17, 43, 70, 98, 127, 9, 40, 72, 105, 139, 174, 21, 58, 96, 135, 175, 216, 23, 66, 110, 155, 201, 248, 10, 59, 109, 160, 212, 265, 319, 32, 88, 145, 203, 262, 322, 383, 42, 105

Offset

0,2

Links

Table of n, a(n) for n=0..62.

Crossrefs

Cf. A064766, A064865, A065221, A065222, A065224-A065234.

Sequence in context: A016580 A309324 A220072 * A248154 A274415 A292584

Adjacent sequences: A065220 A065221 A065222 * A065224 A065225 A065226

Keyword

easy,nonn

Author

Floor van Lamoen, Oct 22 2001

Status

approved