A361120 -id:A361120 - cp's OEIS frontend

A361119 a(n) is the least prime factor of A360519(n) with a(1) = 1.

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

Offset: 1

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

nonn

See A361120 for the greatest prime factors.

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

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

Cf. A020639, A360519, A361120.

PARI
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See Links section.
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a(n) = A020639(A360519(n)).

A361327 a(n) is the greatest prime factor of A361321(n) with a(1) = 1.

Original entry on oeis.org

1, 3, 5, 7, 7, 11, 11, 7, 13, 13, 5, 11, 11, 7, 13, 13, 17, 17, 19, 19, 17, 17, 7, 5, 23, 23, 19, 19, 11, 23, 23, 13, 11, 29, 29, 7, 13, 31, 31, 23, 23, 37, 37, 11, 29, 29, 11, 41, 41, 31, 31, 13, 43, 43, 37, 37, 17, 47, 47, 53, 53, 59, 59, 61, 61, 13, 13, 67, 67, 71, 71, 73, 73, 79, 79, 11, 17

Offset: 1