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 A094409 #10 Aug 29 2021 19:08:25 %S A094409 323,6479,7743,11663,18407,19043,23407,27071,34943,35207,39203,44099, %T A094409 47519,51983,53663,54839,65471,72831,78089,79547,82983,86063,94667, %U A094409 104663,109871,121103,139359,142883,157079,168299,195227,196559 %N A094409 Odd numbers k that divide Fibonacci(k) - 1 but not Fibonacci(k-1). %H A094409 Giovanni Resta, <a href="/A094409/b094409.txt">Table of n, a(n) for n = 1..1000</a> %t A094409 Select[Range[50000], OddQ[ # ] && Mod[Fibonacci[ # ] - 1, # ] == 0 && ! Mod[Fibonacci[ # - 1], # ] == 0 &] %Y A094409 Cf. A069106, A094394, A094410. %K A094409 nonn %O A094409 1,1 %A A094409 _Eric Rowland_, May 01 2004 %E A094409 Offset corrected by _Giovanni Resta_, Jul 20 2013