1,2

Conjecture: every prime appears infinitely often in this sequence.

Table of n, a(n) for n=1..81.

a(n) = A006530(n + A000720(n)).

(PARI) gpf(n) = if (n==1, 1, vecmax(factor(n)[, 1]));

a(n) = gpf(n + primepi(n)); \\ Michel Marcus, Feb 24 2023

Cf. A000720, A006530, A095117.

Sequence in context: A357469 A245509 A085849 * A205009 A101778 A292570

Adjacent sequences: A100478 A100479 A100480 * A100482 A100483 A100484

easy,nonn,less

Jonathan Vos Post, Nov 22 2004

Extended by Ray Chandler, Nov 27 2004

approved