A087149 Least positive multiples of index n that can result from the self-convolution of a monotonically increasing sequence (A087148).

1, 2, 4, 7, 12, 19, 28, 39, 52, 67, 83, 101, 122, 147, 176, 210, 250, 295, 343, 395, 452, 515, 584, 661, 749, 845, 951, 1065, 1193, 1334, 1492, 1667, 1861, 2075, 2308, 2560, 2833, 3132, 3453, 3800, 4172, 4579, 5011, 5477, 5975, 6513, 7080, 7683, 8325, 9008

Offset

1,2

Links

Table of n, a(n) for n=1..50.

Formula

n*a(n) = sum(k=1, n, A087148(k)*A087148(n-k+1)), n>=1.

Crossrefs

Cf. A087148.

Sequence in context: A192521 A066699 A188425 * A090853 A333311 A266464

Adjacent sequences: A087146 A087147 A087148 * A087150 A087151 A087152

Keyword

nonn

Author

Paul D. Hanna, Aug 19 2003

Status

approved