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 A112634 #33 Dec 03 2024 12:44:05 %S A112634 2,5,13,17,61,89,521,2281,3217,4253,9689,9941,11213,19937,21701,23209, %T A112634 44497,132049,859433,1398269,2976221,3021377,6972593,13466917, %U A112634 30402457,32582657,42643801,43112609,57885161 %N A112634 Mersenne prime indices that are not Gaussian primes. %C A112634 57885161, 74207281 and 77232917 are in this sequence as well. - _Ivan Panchenko_, Apr 13 2018 %C A112634 82589933 is in the sequence as well. - _David Benjamin_, Mar 30 2022 %C A112634 136279841 is in the sequence. - _David Benjamin_, Nov 11 2024 %C A112634 Other than the term 2, primes p (A000043) such that 2^p - 1 is prime (A000668) and congruent to 31 mod 120. - _Jianing Song_, Nov 18 2024 %H A112634 Chris K. Caldwell, <a href="https://t5k.org/largest.html">The largest known primes</a>. %F A112634 A000043 INTERSECT A002313. - _R. J. Mathar_, Oct 06 2008 %F A112634 A000043 SET-MINUS A112633. %t A112634 Select[MersennePrimeExponent[Range[48]], Mod[#, 4] != 3 &] (* _Amiram Eldar_, Oct 18 2024 *) %o A112634 (PARI) is(n)=n%4 < 3 && isprime(n) && isprime(2^n-1) \\ _Charles R Greathouse IV_, Nov 28 2016 %Y A112634 Cf. A000043, A112633, A002313. %K A112634 nonn,more %O A112634 1,1 %A A112634 _Jorge Coveiro_, Dec 27 2005 %E A112634 Edited by _R. J. Mathar_, Oct 06 2008 %E A112634 a(26)-a(28) from _Ivan Panchenko_, Apr 13 2018 %E A112634 a(29) from _Amiram Eldar_, Oct 18 2024