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 A059266 #33 Nov 28 2023 18:34:19 %S A059266 2,3,5,6,7,10,11,12,47,58,61,75,87,133,168,226,347,425,868,1977,2815, %T A059266 3378,4385,5286,7057,7200,8230,8340,13175,17226,18276,25237,33211, %U A059266 58463,59662,94555,120502,177473,197017,351097,375370,563190,673872,881002,1043375 %N A059266 Numbers k such that 4^k - 3 is prime. %C A059266 The halved even terms of A050414. - _R. J. Mathar_, Feb 26 2008 %D A059266 Daniel Minoli, Voice over MPLS, McGraw-Hill, New York, NY, 2002, ISBN 0-07-140615-8 (p.114-134) [From Daniel Minoli (daniel.minoli(AT)ses.com), Aug 26 2009] %D A059266 Daniel Minoli, New Results For Hyperperfect Numbers, Abstracts American Math. Soc., October 1980, Issue 6, Vol. 1, pp. 561. [From Daniel Minoli (daniel.minoli(AT)ses.com), Aug 26 2009] %H A059266 Daniel Minoli, W. Nakamine, <a href="http://dx.doi.org/10.1109/ICASSP.1980.1170906">Mersenne Numbers Rooted On 3 For Number Theoretic Transforms</a>, 1980 IEEE International Conf. on Acoust., Speech and Signal Processing. [From Daniel Minoli (daniel.minoli(AT)ses.com), Aug 26 2009] %e A059266 For k = 10, 4^10 - 3 = 1048573 is prime. %t A059266 Select[Range[10000], PrimeQ[4^# - 3] &] (* _G. C. Greubel_, Jan 03 2016 *) %o A059266 (PARI) is(n)=isprime(4^n-3) \\ _Charles R Greathouse IV_, Feb 17 2017 %Y A059266 Cf. A050414, A217348 (similar sequence). %K A059266 nonn %O A059266 1,1 %A A059266 _G. L. Honaker, Jr._, Jan 23 2001 %E A059266 425 and 868 found by _Andrey V. Kulsha_, Feb 02 2001 %E A059266 More terms (not certified prime) from _Jason Earls_, Jan 04 2002 %E A059266 9 more terms from _Ryan Propper_, Feb 27 2008 %E A059266 a(32)-a(41) derived from A050414 by _Robert Price_, Apr 26 2014 %E A059266 a(42)-a(45) derived from A050414 by _Elmo R. Oliveira_, Nov 28 2023