OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..10000
C. Rivera, See also Carlos Rivera's Puzzle Site.
MATHEMATICA
Select[Prime[Range[20000]], Total[IntegerDigits[#]] == 28 &] (* Vincenzo Librandi, Apr 22 2014 *)
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
Patrick De Geest, May 15 1999
EXTENSIONS
Checked by Zak Seidov, Mar 26 2006
STATUS
approved