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 A341660 #12 Mar 04 2021 01:43:25 %S A341660 2,3,5,7,11,13,17,19,23,31,37,47,73 %N A341660 Primes p such that p^2 - 1 has fewer than 32 divisors. %C A341660 For all primes p > 73, p^2 - 1 has at least A309906(2)=32 divisors. %e A341660 p = factorization %e A341660 n a(n) p^2 - 1 of p^2 - 1 tau(p^2 - 1) %e A341660 -- ---- ------- -------------- ------------ %e A341660 1 2 3 3 2 %e A341660 2 3 8 2^3 4 %e A341660 3 5 24 2^3 * 3 8 %e A341660 4 7 48 2^4 * 3 10 %e A341660 5 11 120 2^3 * 3 * 5 16 %e A341660 6 13 168 2^3 * 3 * 7 16 %e A341660 7 17 288 2^5 * 3^2 18 %e A341660 8 19 360 2^3 * 3^2 * 5 24 %e A341660 9 23 528 2^4 * 3 * 11 20 %e A341660 10 31 960 2^6 * 3 * 5 28 %e A341660 11 37 1368 2^3 * 3^2 * 19 24 %e A341660 12 47 2208 2^5 * 3 * 23 24 %e A341660 13 73 5328 2^4 * 3^2 * 37 30 %t A341660 Select[Range[100], PrimeQ[#] && DivisorSigma[0, #^2 - 1] < 32 &] (* _Amiram Eldar_, Feb 26 2021 *) %Y A341660 Cf. A000005, A000040, A309906, A341655, A341658. %K A341660 nonn,fini,full %O A341660 1,1 %A A341660 _Jon E. Schoenfield_, Feb 26 2021