

A133382


Numbers n such that gcd( n!1, 2^n1 ) is neither 1 nor 2n+1.


0




OFFSET

1,1


COMMENTS

This subsequence of A068483 lists the rare exceptions for which gcd( N!, 2^N1 ) <> 2N+1. Is it finite? Are all elements multiples of 5?


LINKS

Table of n, a(n) for n=1..3.


PROG

(PARI) for(n=1, 10^5, if((g=gcd(n!1, 2^n1)1) & g!=2*n, print(n", ")))


CROSSREFS

Cf. A068483, A068480.
Sequence in context: A223452 A015223 A129625 * A199901 A251249 A264673
Adjacent sequences: A133379 A133380 A133381 * A133383 A133384 A133385


KEYWORD

nonn,bref


AUTHOR

M. F. Hasler, Oct 28 2007


STATUS

approved



