A359230 a(n) is the index of the smallest square pyramidal number with exactly n distinct prime factors.

1, 2, 3, 4, 17, 27, 76, 220, 747, 2232, 5719, 18980, 159340, 437580, 1672307, 10891075, 78604064

Offset

0,2

Links

Table of n, a(n) for n=0..16.

Eric Weisstein's World of Mathematics, Distinct Prime Factors

Eric Weisstein's World of Mathematics, Square Pyramidal Number

Crossrefs

Cf. A000330, A001221, A359193, A359229.

Sequence in context: A111191 A333825 A115891 * A293035 A037394 A037430

Adjacent sequences: A359227 A359228 A359229 * A359231 A359232 A359233

Keyword

nonn,more

Author

Ilya Gutkovskiy, Dec 22 2022

Extensions

a(16) from Jon E. Schoenfield, Dec 22 2022

Status

approved