OFFSET
1,1
EXAMPLE
2 is a term because A001372(2) = 3 is prime.
CROSSREFS
KEYWORD
nonn,less,hard,more
AUTHOR
Jonathan Vos Post, Nov 29 2006
EXTENSIONS
a(7) corrected and a(9) from Sean A. Irvine, Jan 16 2021
a(10) from Daniel Suteu, Jan 16 2021
STATUS
approved