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 A223548 #29 Jul 20 2025 08:53:21 %S A223548 13,229,269,331,1036991,193,1187,379,942381313,1078717,1690920279179, %T A223548 593,181,1433,641,139,631,2622013,1123,130337,223,155784593,3746107, %U A223548 1223,13791824242727551,67623587,853,299635177,3966293,197,4755811387725362803,263,40637,577 %N A223548 Smallest prime factors for sequence A223546. %H A223548 Sean A. Irvine, <a href="/A223548/b223548.txt">Table of n, a(n) for n = 1..75</a> (terms 1..34 from Sidney Cadot) %F A223548 a(n) = A020639(A223546(n)). %F A223548 a(n) = 463 for n >= 74. - _Sean A. Irvine_, Jul 20 2025 %e A223548 a(3) = 229, the smallest prime factor of A223546(3) = 233335657 = 229*307*3319. %Y A223548 Cf. A020639, A223546, A285528. %K A223548 nonn %O A223548 1,1 %A A223548 _Paul Larm_, Mar 21 2013 %E A223548 a(15)-a(34) from _Chai Wah Wu_, Oct 10 2019