OFFSET
1,3
FORMULA
A003418(n-2) divides a(n), and a(n) = A003418(n) if n is odd or n is even and n+1 is not a prime power. - Charlie Neder, Feb 03 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Mar 28 2003
EXTENSIONS
a(4) corrected and a(6)-a(18) from Charlie Neder, Feb 03 2019
More terms from Jinyuan Wang, May 03 2020
STATUS
approved