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 #13 Mar 05 2023 12:41:05
%S 3,13,17,18,19,21,20,19,21,23,26,27,26,27,30,42,48,137,51,52,53,54,63,
%T 73,88,90,101,110,123,113,140,115,118,121,110,123,128,133,149,48,137,
%U 113,140,133,149
%N Numbers k such that the sum of the terms of the continued fraction for the harmonic mean of k and the k-th prime is prime.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/ContinuedFraction.html">Continued Fraction</a>.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/HarmonicMean.html">Harmonic Mean</a>.
%Y Cf. A107919 (sum of terms of continued fraction for the harmonic mean of n and n-th prime), A107923 (primes occurring in A107919).
%K nonn,more
%O 1,1
%A _Zak Seidov_, May 28 2005