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

Author

Pontus von Brömssen, Jan 08 2025

Keywords

• nonn
• more

Comments

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

Crossrefs

Cf. A080851, A373711, A379973, A379974.

Formula

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