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=head1 NAME
invmod - compute modular inverse of an integer
=head1 SYNOPSIS
invmod <a> <m>
=head1 DESCRIPTION
The B<invmod> program computes the inverse of I<a>, modulo I<m>, if
that inverse exists. Both I<a> and I<m> are arbitrary-precision
integers in decimal notation. The result is written in standard
decimal notation to the standard output.
If there is no inverse, the message:
No inverse
...will be printed to the standard output (an inverse exists if and
only if the greatest common divisor of I<a> and I<m> is 1).
=head1 SEE ALSO
gcd(1), isprime(1), lap(1)
=head1 AUTHOR
Michael J. Fromberger <sting@linguist.dartmouth.edu>
Thayer School of Engineering, Hanover, New Hampshire, USA
