OFFSET
1,1
COMMENTS
Except for the first term, all the others are multiples of 3.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..5000
Eric Weisstein's World of Mathematics, Cousin Primes
EXAMPLE
The digit sum of the cousin prime pairs 223 and 227 is: 2+2+3+2+2+7 = 18.
MATHEMATICA
cptot[n_]:=Total[Join[IntegerDigits[n], IntegerDigits[n+4]]]; cptot/@Select[ Prime[Range[500]], PrimeQ[#+4]&] (* Harvey P. Dale, Apr 27 2014 *)
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Parthasarathy Nambi, Nov 07 2009
STATUS
approved