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 A174265 #10 Oct 21 2024 04:36:39 %S A174265 3,5,7,13,17,19,31,61,89,107,127,521,607,1279,2203,2281,3217,4253, %T A174265 4423,9689,9941,11213,19937,21701,23209,44497,86243,110503,132049, %U A174265 216091,756839,859433,1257787,1398269,2976221,3021377,6972593,13466917 %N A174265 Odd Mersenne exponents. %C A174265 Primes p such that exactly one of 2^p-1 and 2^p+1 is prime. %H A174265 Amiram Eldar, <a href="/A174265/b174265.txt">Table of n, a(n) for n = 1..47</a> %F A174265 a(n) = A000043(n+1). %t A174265 MersennePrimeExponent[Range[2, 48]] (* _Amiram Eldar_, Oct 21 2024 *) %Y A174265 Cf. A000043, A092506. %K A174265 nonn %O A174265 1,1 %A A174265 _Juri-Stepan Gerasimov_, Mar 14 2010 %E A174265 Corrected by _Charles R Greathouse IV_, Mar 19 2010