OFFSET
1,2
EXAMPLE
a(7) = 331, 331 is the 7th prime with digit sum 7. The smaller six primes are 7,43,61,223,241 and 313.
CROSSREFS
KEYWORD
nonn,base,less
AUTHOR
Amarnath Murthy, Sep 19 2002
EXTENSIONS
More terms from David Wasserman, Jan 16 2005
STATUS
approved