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

A359016

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

Terms

    a(0) =4a(1) =7a(2) =9a(3) =16a(4) =31a(5) =48a(6) =28a(7) =160a(8) =54a(9) =512a(10) =128a(11) =512a(12) =946a(13) =4224a(14) =512a(15) =10240a(16) =11566a(17) =4095a(18) =1024a(19) =65535a(20) =94794a(21) =180224a(22) =22796a(23) =262143a(24) =1048575a(25) =7077888a(26) =1339848

External references