%I
%S 3,7,23,47,83,103,107,127,151,269,277,311,419,463,467,541,967,983,
%T 1231,1249,1279,1601,1867,3527,3643,4457,5279,5711,5813,9613,11057,
%U 12713,13451
%N From table of maximal epacts e(p) and corresponding primes p, for x_0=2, x_{m+1} = (x_m)^21; sequence gives p.
%D R. K. Guy, How to factor a number, Proc. 5th Manitoba Conf. Numerical Math., Congress. Num. 16 (1975), 4989.
%Y Cf. A014425.
%K nonn
%O 1,1
%A _N. J. A. Sloane_.
