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

1,1

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.

Links

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

Formula

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

Crossrefs

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

Sequence in context: A087576 A337328 A201700 * A087575 A001270 A029630

Adjacent sequences: A379970 A379971 A379972 * A379974 A379975 A379976

Keyword

nonn,more

Author

Pontus von Brömssen, Jan 08 2025

Status

approved