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

Author

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

Keywords

• nonn
• look

Comments

See A361119 for the least prime factors.

Examples

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

Links

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

Crossrefs

Cf. A006530, A360519, A361119.

Programs

PARI

See Links section.

Formula

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