1,3

V. Raman, Table of n, a(n) for n = 1..100.

(PARI) for(i=0, 200, i++; m=0; for(x=1, i, if(((2^x+1))%i==0, m=x; break)); print1(m", ")) \\ V. Raman, Nov 22 2012

Cf. A002326.

Sequence in context: A285310 A262946 A343932 * A094720 A334495 A155800

Adjacent sequences: A216437 A216438 A216439 * A216441 A216442 A216443

nonn

V. Raman, Sep 07 2012

approved