OFFSET
1,1
LINKS
Tyler Busby, Table of n, a(n) for n = 1..170 (terms 1..100 from Chai Wah Wu, terms 101..165 from Max Alekseyev)
Reinhard Zumkeller, Products of largest prime factors of numbers <= n
PROG
(PARI) gpf(n) = if (n==1, 1, vecmax(factor(n)[, 1])); \\ A006530
spf(n) = if (n==1, 1, vecmin(factor(n)[, 1])); \\ A020639
a(n) = spf(prod(i=2, n, gpf(i))+1); \\ Michel Marcus, Feb 21 2023
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Mar 06 2005
EXTENSIONS
Corrected by D. S. McNeil, Dec 10 2010
STATUS
approved