OFFSET
1,1
EXAMPLE
a(3)=191 is a term because sum of digits of four consecutive primes i.e. (191, 193, 197, 199), whose sum of digits (i.e. 11, 13, 17, 19)is a set of four distinct primes.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Shyam Sunder Gupta, May 18 2005
STATUS
approved