OFFSET
1,1
COMMENTS
The numbers corresponding to the second and third terms are probable primes.
a(3) > 26580. - Giovanni Resta, Mar 01 2013
a(4) > 43200 according to Thomas Ritschel (2013). - M. F. Hasler, Oct 31 2014
LINKS
Carlos Rivera, Puzzle 653, published in (Aug./Sep.?) 2012, answers added between March and October 2013; The Prime Puzzles and Problems Connection.
CROSSREFS
KEYWORD
nonn,base,bref,hard,more
AUTHOR
Farideh Firoozbakht, Jun 16 2010
EXTENSIONS
a(3) from Thomas Ritschel (2013), added by Arkadiusz Wesolowski, Oct 30 2014
STATUS
approved