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 A363039 #23 Feb 16 2025 08:34:05 %S A363039 1,2,4,274,81,44 %N A363039 a(n) is the smallest tribonacci number (A000073) with exactly n divisors, or -1 if no such number exists. %C A363039 a(8) = 24, a(10) = 745527911414639917440582097294401. %C A363039 a(7), if it exists, is > A000073(200000). - _Vaclav Kotesovec_, May 17 2023 %C A363039 Has an infinite number of -1's for a(p) where p is prime as A000073 only contains a finite number of perfect powers (see Theorem 1 of Petho link). - _Michael S. Branicky_, May 17 2023 %H A363039 Attila Petho, <a href="https://www.emis.de/journals/AUSM/C2-1/math21-5.pdf">Fifteen problems in number theory</a>, Acta Univ. Sapientiae Math 2:1 (2010), 72-83. %H A363039 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/TribonacciNumber.html">Tribonacci Number</a>. %H A363039 <a href="/index/Di#divisors">Index entries for sequences related to divisors of numbers</a>. %Y A363039 Cf. A000005, A000073, A005179, A081979. %K A363039 sign,more %O A363039 1,2 %A A363039 _Ilya Gutkovskiy_, May 14 2023