OFFSET
1,2
COMMENTS
The subsequence of primes begins 5, then no more through a(34). What is the next prime? - Jonathan Vos Post, Jan 07 2011
LINKS
Charlie Neder, Table of n, a(n) for n = 1..1000
EXAMPLE
Sequences b for n = 2 are {1}, {2}, {1, 1}, {2, 1}, {1, 2}, so a(2)=5.
CROSSREFS
KEYWORD
nice,nonn
AUTHOR
Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Oct 02 2001
EXTENSIONS
a(21)-a(34) from Donovan Johnson, Sep 06 2010
STATUS
approved