A379975 A373711(n) is equal to the a(n)-th A379973(n)-gonal pyramidal number.

0, 1, 3, 8, 5, 6, 11, 10, 20, 24, 18, 34, 17, 25, 15, 46, 33, 34, 26, 73, 28, 106, 145, 190, 204, 241, 162, 298, 113, 361, 103, 430, 505, 586, 673, 766, 865, 970, 1081, 624, 1198, 1321, 420, 1450, 1585, 1726

Offset

1,3

Comments

Indices to pyramidal numbers are chosen so that the first k-gonal pyramidal number is 1 (and the zeroth is 0).

Links

Table of n, a(n) for n=1..46.

Formula

A080851(A379973(n)-2,a(n)-1) = A373711(n).

Crossrefs

Cf. A080851, A373711, A379973, A379974.

Sequence in context: A193014 A155676 A200243 * A236229 A343920 A258985

Adjacent sequences: A379972 A379973 A379974 * A379976 A379977 A379978

Keyword

nonn,more

Author

Pontus von Brömssen, Jan 08 2025

Status

approved