A379973 Least k >= 3 such that A373711(n) is both k-gonal and k-gonal pyramidal.

3, 3, 3, 3, 10, 14, 6, 8, 3, 4, 8, 3, 30, 11, 88, 14, 43, 50, 276, 17, 322, 20, 23, 26, 41, 29, 145, 32, 823, 35, 2378, 38, 41, 44, 47, 50, 53, 56, 59, 374, 62, 65, 2386, 68, 71, 74

Offset: 1

Author

Pontus von Brömssen, Jan 08 2025

Keywords

• nonn
• more

Comments

For n <= 46, there is a unique k >= 3 such that A373711(n) is both k-gonal and k-gonal pyramidal. If this were true for all n, A027669 would be the sorted distinct terms of this sequence.

Crossrefs

Cf. A027669, A057145, A080851, A373711, A379974, A379975.

Formula

A057145(a(n),A379974(n)) = A080851(a(n)-2,A379975(n)-1) = A373711(n).