A247451 - OEIS

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A247451

Largest primorial factor of n-th least product of primorial numbers, cf. A025487.

1, 2, 2, 6, 2, 6, 2, 6, 30, 2, 6, 6, 30, 2, 6, 6, 30, 2, 6, 30, 6, 210, 6, 30, 2, 6, 30, 6, 210, 6, 30, 2, 6, 30, 6, 210, 6, 30, 30, 2, 30, 6, 210, 6, 30, 6, 210, 6, 30, 30, 2, 30, 6, 2310, 210, 6, 30, 6, 210, 6, 30, 30, 2, 30, 6, 2310, 210, 6, 30, 30, 6

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OFFSET

1,2

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = A007947(A025487(n)) = A002110(A061394(n)).

MATHEMATICA

(* First, load program f at A025487 *)

Map[Product[Prime[i], {i, PrimeNu[#]}] &, Union@ Flatten@ f[6]] (* Michael De Vlieger, Jun 24 2024 *)

PROG

(Haskell)