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

1,2

Comments

See A361119 for the least prime factors.

Links

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

Rémy Sigrist, PARI program

Formula

a(n) = A006530(A360519(n)).

Example

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

Prog

(PARI) See Links section.

Crossrefs

Cf. A006530, A360519, A361119.

Sequence in context: A130159 A127314 A294499 * A092257 A316189 A342668

Adjacent sequences: A361117 A361118 A361119 * A361121 A361122 A361123

Keyword

nonn,look

Author

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

Status

approved