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 A062969 #9 Apr 15 2023 23:32:40 %S A062969 3,4,6,8,9,10,12,14,18,22,24,25,26,28,30,34,46,49,52,54,62,66,72,74, %T A062969 76,78,80,82,84,86,90,104,106,108,110,112,114,134,138,142,150,160,166, %U A062969 169,170,172,174,176,180,186,192,194,202,204,208,214,226,230,234,244,246 %N A062969 Numbers k such that abs(d(k)-k-1) is prime, where d(k) is the number of divisors of k. %e A062969 d(300)-300-1 = -283, absolute value of which is prime. %o A062969 (PARI) j=[]; for(n=1,300, if(isprime(numdiv(n)-n-1),j=concat(j,n))); j %Y A062969 Cf. A062968. %K A062969 easy,nonn %O A062969 1,1 %A A062969 _Jason Earls_, Jul 23 2001