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 A379230 #11 Dec 23 2024 09:42:00 %S A379230 3,21,5,39,87,45,7,153,81,85,309,267,195,63,91,531,95,-11,99,327,345, %T A379230 1023,81,175,909,117,705,573,321,605,159,413,-65,1737,435,121,453, %U A379230 1551,125,1149,117,189,1215,183,3261,205,579,447,735,2943,-119,171,775,579,253,807,2355,357,153,1971,155,189,1227,2085 %N A379230 Difference A003961(k)-(2*k) computed for the natural numbers k for which gcd(k,A003961(k)) > 1, where A003961 is fully multiplicative with a(prime(i)) = prime(i+1). %C A379230 Each of the primes 3, 5, 7 occur here just once, while some other primes may occur multiple times, although very rare in general. See A379231 and A379232. %H A379230 Antti Karttunen, <a href="/A379230/b379230.txt">Table of n, a(n) for n = 1..20000</a> %H A379230 <a href="/index/Pri#prime_indices">Index entries for sequences related to prime indices in the factorization of n</a>. %F A379230 a(n) = A252748(A104210(n)). %Y A379230 Cf. A104210, A252748. %Y A379230 Cf. A379231 (terms whose absolute value is a prime), A379232 (corresponding terms of A104210). %Y A379230 Cf. also A379233, A379235, A379237. %K A379230 sign %O A379230 1,1 %A A379230 _Antti Karttunen_, Dec 22 2024