A359015 a(n) is the index of the smallest n-gonal pyramidal number with exactly n distinct prime factors.

7, 17, 84, 115, 220, 468, 3058, 5719, 18290, 182104, 144738, 1984619, 12051935

Offset

3,1

Links

Table of n, a(n) for n=3..15.

Eric Weisstein's World of Mathematics, Distinct Prime Factors

Eric Weisstein's World of Mathematics, Pyramidal Number

Crossrefs

Cf. A358864, A359016.

Sequence in context: A122528 A123206 A035078 * A177123 A124165 A239150

Adjacent sequences: A359012 A359013 A359014 * A359016 A359017 A359018

Keyword

nonn,more

Author

Ilya Gutkovskiy, Dec 12 2022

Status

approved