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 A171092 #20 Aug 02 2025 18:13:58 %S A171092 2,2,2,2,2,2,3,2,2,2,3,3,2,3,3,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,2,2,2,2, %T A171092 2,2,2,3,2,2,3,2,2,2,2,3,2,3,2,3,2,2,2,2,2,3,2,2,2,2,2,2,2,2,2,2,2,2, %U A171092 2,2,2,3,2,2,2,2,2,3,2,2,2,3,2,2,3,2,2,2,2,2,2,2,2,2,2,3,2,2,2,3,2,3,2,2,2 %N A171092 Smallest prime factor of smaller of amicable pair. %H A171092 Amiram Eldar, <a href="/A171092/b171092.txt">Table of n, a(n) for n = 1..10000</a> %H A171092 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/AmicablePair.html">Amicable Pair</a>. %F A171092 a(n) = A020639(A002025(n)). %e A171092 The example 5480828320492525 shows that the sequence contains a 5. - _Charles R Greathouse IV_, Aug 16 2010 %e A171092 Does it contain a 7? Does it contain all primes? - _Charles R Greathouse IV_, Jan 28 2011 %Y A171092 Cf. A002025, A002046. %K A171092 nonn %O A171092 1,1 %A A171092 _N. J. A. Sloane_, Sep 08 2010, based on a posting to the Sequence Fans Mailing List by _Jonathan Vos Post_, Aug 16 2010 %E A171092 More terms from _R. J. Mathar_, _Robert G. Wilson v_ and _John W. Layman_, Sep 09 2010