OFFSET
1,1
COMMENTS
Except for the first term, all the others are multiples of 3.
LINKS
Chris Caldwell, The First 100,000 Twin Primes
EXAMPLE
The tenth twin prime pair is 107, 109, so a(10) = 1+0+7+1+0+9 = 18.
MATHEMATICA
Total[Flatten[IntegerDigits[#]]]&/@Select[Partition[Prime[Range[400]], 2, 1], #[[2]]- #[[1]]==2&] (* Harvey P. Dale, Dec 03 2016 *)
CROSSREFS
KEYWORD
base,nonn,easy
AUTHOR
Parthasarathy Nambi, Oct 09 2009
EXTENSIONS
Corrected by Harvey P. Dale, Dec 03 2016
STATUS
approved