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

Author

Ilya Gutkovskiy, Dec 22 2022

Keywords

• nonn
• more

Links

• Eric Weisstein's World of Mathematics, Distinct Prime Factors
• Eric Weisstein's World of Mathematics, Square Pyramidal Number

Crossrefs

Cf. A000330, A001221, A359193, A359229.

Extensions

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