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 A356826 #26 Dec 10 2023 09:17:13 %S A356826 5,8,104,212,79316,102272,225536,340688 %N A356826 Numbers k such that 2^k - 29 is prime. %C A356826 A particularly low-density pseudo-Mersenne sequence. I have verified that there are no additional terms for k < 5*10^4. For k = a(5), a(6), a(7), and a(8), 2^k - 29 is a probable prime (see link). %C A356826 The terms a(5)-a(8) were discovered by Henri Lifchitz (see link). - _Elmo R. Oliveira_, Nov 29 2023 %C A356826 Empirically: except for 5, all terms are even. - _Elmo R. Oliveira_, Nov 29 2023 %H A356826 Henri Lifchitz and Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop/searchform.php?form=2%5En-29">Search for 2^n-29</a>, PRP Top Records. %e A356826 5 is a term because 2^5 - 29 = 3 is prime. %e A356826 8 is a term because 2^8 - 29 = 227 is prime. %o A356826 (PARI) for(n=2, 1000, if(isprime(2^n-29), print1(n, ", "))) %Y A356826 Cf. A096502. %Y A356826 Cf. Sequences of numbers k such that 2^k - d is prime: A000043 (d=1), A050414 (d=3), A059608 (d=5), A059609 (d=7), A059610 (d=9), A096817 (d=11), A096818 (d=13), A059612 (d=15), A059611 (d=17), A096819 (d=19), A096820 (d=21), A057220 (d=23), this sequence (d=29). %K A356826 nonn,more %O A356826 1,1 %A A356826 _Craig J. Beisel_, Aug 29 2022