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 A359640 #4 Jan 30 2023 12:29:56 %S A359640 307,1999,101527,7146697,272572999,4809363523 %N A359640 a(n) is the least odd prime not in A001359 such that all subsequent composites in the gap up to the next prime have exactly n odd prime factors, counted with multiplicity. %e A359640 a(2) = 307: 308 = 2^2*7*11, 309 = 3*103, 310 = 2*5*31, all have exactly 2 odd prime factors. %o A359640 (PARI) a087436(n) = bigomega (n >> valuation (n, 2)); %o A359640 a359640(maxp) = {my(k=2, pp=5); forprime (p=7, maxp, my(mi=oo, ma=0); if (p-pp>2, for (j=pp+1, p-1, my(mo=a087436(j)); if (mo<k, mi=ma=0; break); mi=min(mo, mi); ma=max(mo, ma)); if (mi==k && ma==k, print1(pp, ", "); k++)); pp=p)}; %o A359640 a359640(3*10^8) %Y A359640 Cf. A001222, A001359, A087436, A359637, A359639. %K A359640 nonn,hard,more %O A359640 2,1 %A A359640 _Hugo Pfoertner_, Jan 16 2023