A280086 - OEIS

A280086

Partial products of A206032 (Product_{d|n} sigma(d)).

1, 3, 12, 252, 1512, 217728, 1741824, 548674560, 28531077120, 9244068986880, 110928827842560, 3130855237028413440, 43831973318397788160, 25247216631397125980160, 14542396779684744564572160, 142006504553621530673047142400, 2556117081965187552114848563200

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OFFSET

1,2

COMMENTS

sigma(n) is the sum of the divisors of n (A000203).

LINKS

Table of n, a(n) for n=1..17.

FORMULA

a(n) = Product_{i=1..n} A206032(i).

MATHEMATICA

FoldList[Times[#1, #2] &, Array[Product[DivisorSigma[1, d], {d, Divisors@ #}] &, 17]] (* Michael De Vlieger, Dec 26 2016 *)

PROG