OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..200
MATHEMATICA
NestList[NextPrime[10 #, -1]&, 31, 30] (* Vincenzo Librandi, Jun 28 2014 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Artur Jasinski, Dec 16 2006
STATUS
approved