a(n) is the index of the smallest square pyramidal number with exactly n distinct prime factors.
A359230
a(n) is the index of the smallest square pyramidal number with exactly n distinct prime factors.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =4a(4) =17a(5) =27a(6) =76a(7) =220a(8) =747a(9) =2232a(10) =5719a(11) =18980a(12) =159340a(13) =437580a(14) =1672307a(15) =10891075a(16) =78604064
External references
- oeis: A359230