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 A240105 #12 Jun 12 2025 12:57:54 %S A240105 1,3490575,83972646,414180489,476072025,1881147720,3020243916, %T A240105 3188924769,3285167214,3543143220,6593858205,8239349955,10914074124, %U A240105 14102235060,15455042889,16196415300,16588528539,16636093485,17688635511,17929182270,18997337436,19290317670,19347263739 %N A240105 Integers m such that 2*m^k + 1, for k = 2..7, are prime. %C A240105 First m>1 such that 2*m^k+1, for k=2..8, are prime, is a(3) = 83972646. %C A240105 Subsequence of A240099: a(2) = 3490575 = A240099(4), a(3) = 83972646 = A240099(22). %Y A240105 Cf. A089001, A168550, A239874, A239925, A240099. %K A240105 nonn %O A240105 1,2 %A A240105 _Zak Seidov_, Apr 01 2014 %E A240105 More terms from _Jinyuan Wang_, Jun 12 2025