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%I #9 Aug 06 2015 05:19:39
%S 2,7,10,15,17,18,19,22,36,37,49,51,55,57,71,73,75,85,90,100,102,105,
%T 107,108,113,130,131,132,138,161,164,167,172,173,184,185,199,206,209,
%U 212,216,226,239,244,251,252,253,257,261,262,265,266,272,315
%N n-th index k such that p(k) + p(k+4) = p(k+1) + p(k+3).
%o (PARI) isok(k) = (prime(k) + prime(k+4)) == (prime(k+1) + prime(k+3)); \\ _Michel Marcus_, Sep 30 2013
%K nonn
%O 1,1
%A _Clark Kimberling_
%E Corrected by _R. J. Mathar_, Aug 06 2015
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