This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A072192 #21 Mar 07 2023 14:33:09 %S A072192 1,2,3,5,9,10,13,16,23,24,30,32,40,41,43,51,52,54,60,62,72,81,83,86, %T A072192 94,97,108,116,119,120,124,128,132,135,140,156,162,170,171,173,176, %U A072192 185,200,201,209,223,228,230,234,239,240,246 %N A072192 Indices of Sophie Germain primes: p and 2p+1 are primes. %D A072192 M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards Applied Math. Series 55, 1964 (and various reprintings), p. 870. %D A072192 J. Roberts, Lure of the Integers, Math. Assoc. America, 1992, p. 83. %H A072192 Harvey P. Dale, <a href="/A072192/b072192.txt">Table of n, a(n) for n = 1..1000</a> %H A072192 M. Abramowitz and I. A. Stegun, eds., <a href="http://www.convertit.com/Go/ConvertIt/Reference/AMS55.ASP">Handbook of Mathematical Functions</a>, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 [alternative scanned copy]. %F A072192 a(n) = A000720(A005384(n)). - _Ridouane Oudra_, Mar 07 2023 %e A072192 5 is element of the sequence, P(5)=11 and 2*11+1=23 is prime. %t A072192 Select[Range[250],PrimeQ[2Prime[#]+1]&] (* _Harvey P. Dale_, Feb 22 2017 *) %Y A072192 Cf. A005384, A000720. %K A072192 easy,nonn %O A072192 1,2 %A A072192 _Miklos Kristof_, Jul 02 2002