A336965 - OEIS

A336965

a(n) is the product of the distinct prime numbers appearing in the prime tower factorization of n.

1, 2, 3, 2, 5, 6, 7, 6, 6, 10, 11, 6, 13, 14, 15, 2, 17, 6, 19, 10, 21, 22, 23, 6, 10, 26, 3, 14, 29, 30, 31, 10, 33, 34, 35, 6, 37, 38, 39, 30, 41, 42, 43, 22, 30, 46, 47, 6, 14, 10, 51, 26, 53, 6, 55, 42, 57, 58, 59, 30, 61, 62, 42, 6, 65, 66, 67, 34, 69, 70

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OFFSET

1,2

COMMENTS

The prime tower factorization of a number is defined in A182318.

For any n > 0, a(n) is the product of the terms in n-th row of A336964.

LINKS

Rémy Sigrist, Table of n, a(n) for n = 1..10000

EXAMPLE

A001221(a(n)) = A115588(n) for any n > 1.

a(n) = A007947(A279513(n)).

a(n) = n iff n is squarefree (A005117).