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 A259867 #11 Jun 29 2017 17:07:08 %S A259867 5,1500,234375,300000000,7500000000000000000000000000, %T A259867 750000000000000000000000000000000000, %U A259867 1500000000000000000000000000000000000000000000000000000000000000000 %N A259867 Exponent of 2 modulo the prime A056807(n). %H A259867 S. W. Golomb, <a href="http://www.jstor.org/stable/2005337">Properties of the sequence 3.2^n+1</a>, Math. Comp., 30 (1976), 657-663. %H A259867 S. W. Golomb, <a href="/A004119/a004119.pdf">Properties of the sequence 3.2^n+1</a>, Math. Comp., 30 (1976), 657-663. [Annotated scanned copy] %p A259867 A259867 := proc(n) %p A259867 p := 3*10^A056807(n)+1 ; %p A259867 numtheory[order](2,p) ; %p A259867 end proc: # _R. J. Mathar_, Jul 15 2015 %Y A259867 Cf. A056807. %K A259867 nonn %O A259867 1,1 %A A259867 _N. J. A. Sloane_, Jul 08 2015