A361119 -id:A361119 - cp's OEIS frontend

A361120 a(n) is the greatest prime factor of A360519(n) with a(1) = 1.

1, 3, 5, 7, 7, 3, 5, 11, 11, 3, 7, 11, 11, 5, 5, 11, 13, 13, 3, 7, 13, 13, 5, 17, 17, 7, 3, 13, 17, 17, 7, 19, 19, 5, 3, 11, 17, 17, 5, 23, 23, 19, 19, 13, 13, 5, 7, 29, 29, 31, 31, 7, 7, 37, 37, 17, 17, 41, 41, 5, 23, 23, 7, 5, 29, 29, 7, 3, 43, 43, 5, 11, 47

Offset: 1

Scott R. Shannon, Rémy Sigrist and N. J. A. Sloane, Mar 03 2023

See A361119 for the least prime factors.

			A360519(2) = 2*3 so a(2) = 3.

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

Cf. A006530, A360519, A361119.

PARI
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See Links section.
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a(n) = A006530(A360519(n)).

A361328 a(n) is the least prime factor of A361321(n) with a(1) = 1.

Original entry on oeis.org

1, 2, 2, 5, 3, 3, 2, 2, 7, 3, 3, 5, 7, 2, 2, 5, 5, 2, 2, 3, 3, 7, 2, 2, 3, 7, 7, 5, 2, 2, 13, 11, 2, 2, 5, 3, 2, 2, 5, 5, 2, 2, 5, 3, 3, 7, 2, 2, 3, 3, 7, 2, 2, 3, 3, 7, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 11, 2, 2, 11, 11, 2, 2, 13, 13, 2, 2, 3, 3, 5, 7, 2, 2, 3, 5, 5

Offset: 1