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 A363750 #13 Oct 25 2024 16:30:28 %S A363750 2,5,13,17,37,41,61,73,89,97,101,109,113,157,181,193,233,241,257,277, %T A363750 281,313,337,349,353,397,401,409,421,433,449,457,461,521,541,577,593, %U A363750 601,613,617,641,661,673,701,733,757,761,769,821,829,877,881,929,937 %N A363750 Primes p such that p-1 can be written as a product of smaller numbers that are also of the form prime-1. %C A363750 Except for 2, this is a subsequence of primes of the form 4k+1 (A002144). - _Davide Rotondo_, Oct 07 2024 %e A363750 2 is a term because 2 is prime and 2-1 = 1 equals the empty product. %e A363750 5 is a term because 5 is prime, 5-1 = 2*2 = (3-1)*(3-1), and 3 is prime. %e A363750 3329 is a term because 3329 is prime, 3329-1 = 4*16*52 = (5-1)*(17-1)*(53-1), and 5, 17, and 53 are prime. (This is the first term that requires more than two factors.) %Y A363750 Cf. A006093, A363636, A363638. %Y A363750 Cf. A002144. %K A363750 nonn %O A363750 1,1 %A A363750 _Pontus von Brömssen_, Jun 19 2023