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%I #11 Jun 29 2017 17:07:08
%S 5,1500,234375,300000000,7500000000000000000000000000,
%T 750000000000000000000000000000000000,
%U 1500000000000000000000000000000000000000000000000000000000000000000
%N Exponent of 2 modulo the prime A056807(n).
%H 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 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 := proc(n)
%p p := 3*10^A056807(n)+1 ;
%p numtheory[order](2,p) ;
%p end proc: # _R. J. Mathar_, Jul 15 2015
%Y Cf. A056807.
%K nonn
%O 1,1
%A _N. J. A. Sloane_, Jul 08 2015