A351518 a(n) = Product_{p|n, p prime} p^((pi(p)+1) mod 2).

1, 1, 3, 1, 1, 3, 7, 1, 3, 1, 1, 3, 13, 7, 3, 1, 1, 3, 19, 1, 21, 1, 1, 3, 1, 13, 3, 7, 29, 3, 1, 1, 3, 1, 7, 3, 37, 19, 39, 1, 1, 21, 43, 1, 3, 1, 1, 3, 7, 1, 3, 13, 53, 3, 1, 7, 57, 29, 1, 3, 61, 1, 21, 1, 13, 3, 1, 1, 3, 7, 71, 3, 1, 37, 3, 19, 7, 39, 79, 1, 3, 1, 1, 21, 1, 43, 87

Offset

1,3

Comments

Product of the even-indexed prime divisors of n (or 1 if no such divisors exist).

Links

Table of n, a(n) for n=1..87.

Example

a(63) = 21; The even-indexed prime divisors of 63 are 3,7 and their product is 21.

Crossrefs

Cf. A000720 (pi), A351517.

Sequence in context: A107294 A161788 A345468 * A170819 A140211 A248101

Adjacent sequences: A351515 A351516 A351517 * A351519 A351520 A351521

Keyword

nonn

Author

Wesley Ivan Hurt, Feb 12 2022

Status

approved