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 A179861 #7 May 24 2024 08:39:26 %S A179861 1,6,42,143100,775304,1891890,14646554832,130985694070,188757015148, %T A179861 419047914740,1055777525624570390,1492138298614167680, %U A179861 70288308055831268412,91779857115464381780,571686203669195590338,56978071532766214007450,83023388015844408083484 %N A179861 a(n) is the sum of the first A179859(n) noncomposites. %C A179861 A variant of A050247 (primes), A073262 (composites) and A164280 (nonprimes). %F A179861 a(n) = A014284(A179859(n)) = A179859(n) * A179860(n). %e A179861 A179859(3) = 7; sum of first 7 noncomposites is 42, so a(3) = 42. %Y A179861 Cf. A008578 (noncomposites), A014284 (sum of first n noncomposites). %Y A179861 Cf. A050247, A073262, A164280, A179859, A179860. %K A179861 nonn %O A179861 1,2 %A A179861 _Ray Chandler_, Jul 29 2010 %E A179861 a(16)-a(17) from _Amiram Eldar_, May 24 2024