A320678 Number of 3-element subsets of [n] having a prime element sum.

0, 1, 2, 6, 10, 18, 26, 37, 47, 62, 76, 96, 116, 143, 170, 205, 241, 285, 329, 382, 434, 495, 555, 627, 698, 781, 865, 962, 1059, 1168, 1276, 1397, 1517, 1652, 1786, 1936, 2086, 2253, 2419, 2600, 2779, 2974, 3168, 3378, 3588, 3818, 4048, 4296, 4543, 4809, 5073

Offset

3,3

Links

Alois P. Heinz, Table of n, a(n) for n = 3..500

Crossrefs

Column k=3 of A282516.

Sequence in context: A281664 A330507 A290220 * A050844 A328960 A282428

Adjacent sequences: A320675 A320676 A320677 * A320679 A320680 A320681

Keyword

nonn

Author

Alois P. Heinz, Oct 19 2018

Status

approved