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A122929 Multiplicative order of 2 mod A141232(n). 4
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..5197

PROG

(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

CROSSREFS

Cf. A141232, A002326, A001262, A141216.

Sequence in context: A044453 A212776 A137019 * A030756 A065006 A291058

Adjacent sequences:  A122926 A122927 A122928 * A122930 A122931 A122932

KEYWORD

nonn

AUTHOR

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

EXTENSIONS

More terms from Michel Marcus, Feb 09 2015

STATUS

approved

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Last modified December 2 17:08 EST 2021. Contains 349445 sequences. (Running on oeis4.)