cp's OEIS Frontend

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.

A038672 Primes p such that the p-th Fibonacci number is composite.

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%I A038672 #21 Aug 05 2021 02:31:04
%S A038672 19,31,37,41,53,59,61,67,71,73,79,89,97,101,103,107,109,113,127,139,
%T A038672 149,151,157,163,167,173,179,181,191,193,197,199,211,223,227,229,233,
%U A038672 239,241,251,257,263,269,271,277,281,283,293,307,311,313,317,331,337
%N A038672 Primes p such that the p-th Fibonacci number is composite.
%H A038672 Hans Havermann, <a href="/A038672/b038672.txt">Table of n, a(n) for n = 1..10000</a>
%H A038672 Hans Havermann, <a href="http://chesswanks.com/num/CompositePrimeIndexFibonaccis.txt">Composite Prime-Index Fibonacci Numbers Factored</a>
%t A038672 Rest[Select[Prime[Range[68]], ! PrimeQ[Fibonacci[#]] &]] (* _Jayanta Basu_, Jul 10 2013 *)
%t A038672 s={A083668}; Complement[Prime[Range[2, 10034]], s] (* _Hans Havermann_, Feb 12 2014 *)
%Y A038672 Cf. A090819 (essentially identical), A083668, A135952.
%K A038672 nonn
%O A038672 1,1
%A A038672 _Jeff Burch_