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 A377465 #29 Feb 16 2025 08:34:07 %S A377465 13,17,31,107,1279,9941,3021377,13466917 %N A377465 Exponents of Mersenne primes that are emirps. %C A377465 The just discovered Mersenne exponent 136279841 is also an emirp. However, it cannot be included as the next member of the sequence as there are Mersenne exponents over 70000000 that have not been double checked yet. %H A377465 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Emirp.html">Emirp</a>. %H A377465 Wikipedia, <a href="https://en.wikipedia.org/wiki/Emirp">Emirp</a>. %e A377465 107 is a term because it is in A000043 and in A006567. %t A377465 Select[MersennePrimeExponent[Range[48]], PrimeQ[p=FromDigits[Reverse[IntegerDigits[#]]]] && p!=# &] (* _Stefano Spezia_, Nov 02 2024 *) %Y A377465 Intersection of A000043 and A006567. %K A377465 nonn,base,more %O A377465 1,1 %A A377465 _Rodolfo Ruiz-Huidobro_, Oct 29 2024