A122929 Multiplicative order of 2 mod A141232(n).

11, 28, 36, 52, 48, 60, 52, 148, 76, 68, 51, 52, 29, 92, 156, 92, 29, 179, 166, 100, 44, 102, 239, 156, 50, 25, 51, 364, 224, 204, 244, 166, 66, 346, 194, 388, 618, 92, 388, 102, 660, 371, 388, 29, 772, 828, 239, 460, 55, 292, 431, 166, 882, 1060, 532, 155, 68

Offset: 1

Author

Vladimir Shevelev, Jul 05 2008, Jul 12 2008, Jul 23 2008

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A141232, A002326, A001262, A141216.

Programs

PARI

a137576(n)=my(t); sumdiv(2*n+1, d, eulerphi(d)/(t=znorder(Mod(2, d))))*t-t+1;
lista(nn) = {forcomposite(n=1, nn, if ((n % 2) && (a137576((n-1)/2) == n), print1(znorder(Mod(2, n)), ", ");););} \\ Michel Marcus, Feb 09 2015

Extensions

More terms from Michel Marcus, Feb 09 2015