Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #23 Sep 18 2015 15:42:09
%S 1,2,2,2,3,3,3,1,1,2,1
%N a(n) = number of 2-digit primes with digit sum n, where n runs through the non-multiples of 3 in the range [2..17].
%H <a href="/A177868/b177868.txt">Table of n, a(n) for n = 1..11</a>
%H BigPrimes.net, <a href="http://www.bigprimes.net/sum-of-digits/">Digit sums of primes</a>
%e Digital sums of 2-digit primes
%e Sum count
%e 2 1
%e 4 2
%e 5 2
%e 7 2
%e 8 3
%e 10 3
%e 11 3
%e 13 1
%e 14 1
%e 16 2
%e 17 1
%Y For 2- through 9-digit primes the counts are in A177868, A178183, A178447, A178571, A178605, A178876, A178879, A178884.
%Y Cf. 2nd row of A178701.
%K nonn,base,fini,full
%O 1,2
%A _N. J. A. Sloane_, Dec 28 2010