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 A385740 #14 Jul 14 2025 17:09:08 %S A385740 1163,7583,17099,48857,65963,172859,5408423,6804047,19247087,73162367, %T A385740 77695043,109775657,109871933,116464757,160454717,175031957,175288493, %U A385740 218543393,268382183,303220769,379299989,705800723,823155779,889218389,967371143,1100618483,1242282407,1701133163 %N A385740 Primes p such that there exists a prime q < p such that sigma(p-1) = sigma(q-1) = p + q. %C A385740 The primes q and p form a P(-1, -1)-amicable pair. See Dimitrov link. %H A385740 S. I. Dimitrov, <a href="https://arxiv.org/abs/2408.07387">Generalizations of amicable numbers</a>, arXiv:2408.07387 [math.NT], 2024. %e A385740 (853, 1163) is such a pair because sigma(853-1) = sigma(1163-1) = 853 + 1163. %Y A385740 Cf. A000040, A000203, A063990, A008333, A259180, A385586, A385718, A385739. %K A385740 nonn,hard %O A385740 1,1 %A A385740 _S. I. Dimitrov_, Jul 08 2025 %E A385740 a(6)-a(25) from _Michel Marcus_, Jul 08 2025 %E A385740 a(26)-a(28) from _Giorgos Kalogeropoulos_, Jul 14 2025