**TALKS**

**2000**

1) Public Key Cryptography and Computational Number Theory, Warschau,

On the
numerical evaluation of (simple) Euler products , 14-09-2000.

2) Stafcolloquium UvA,Wanted
primes, Transparancies (partially in dutch), 04-10-2000.

3) Talk at DMV-seminar `The Riemann zeta-function and Random Matrix
Theory', Oberwolfach, Germany,

Artin's
primitive root conjecture-a survey , 19-10-2000.

4) Talk for first year students on probabilistic aspects of number
theory, Amsterdam.

**2001**

1) Talk on `the multiplicative order' at Utrecht University, 25-04-2001.

2) Idem, at the American Institute of Mathematics, Palo Alto, California,
22-05-2001.

3) Idem, at Centre de Recherches Mathematiques, Montreal, Canada, 28-08-2001.

**2002**

1) AIO-colloquium, UvA, Amsterdam, Ramanujan en zijn tau-functie, March
1.

2) Nederlands Mathematisch Congres, Eindhoven, On Ramanujan's `unpublished'
manuscript on the partition and

tau functions, April 4 (half hour).

3) Universite de Bordeaux, The hexagonal versus the square lattice,
May 23.

4) Max-Planck-Institute, Bonn, The hexagonal versus the square lattice,
June 24 (as part of a workshop ending the activity on analytic number theory,
cf. conferences on my homepage), half hour talk.

5) NWO-OTKA Workshop Explicit algebraic number theory, 30 Sept., half
hour talk.

6) Site visit UvA, The hexagonal versus the square lattice, 19th Nov..

**2003**

1) Max-Planck-Instituut, Bonn, Number Theory Lunch Seminar, The hexagonal
versus the square lattice, March 5th.

2) Eindhoven University, On Artin's primitive root conjecture and some
related problems, April 2nd.

3) University of East-Anglia, Norwich, April 7th, On
the numerical evaluation of (simple) Euler products

4) University of East-Anglia, Norwich, April 7th, On
Artin's primitive root conjecture and some related problems

5) University of East-Anglia, Norwich, April 8th, On
the distribution of the order and index of g(mod p) over residue classes

6) University of East-Anglia, Norwich, April 8th, The hexagonal versus
the square lattice.

7) IMPAN, Warsaw, Conference on computational number theory and
cryptography, May 13th,The hexagonal versus the square lattice.

**2004**

1) Stafcolloquium in Leiden, The hexagonal versus the square lattice,
March 11th.

2) Stafcolloquium in Caen, The multiplicative order and Euler products,
France, March 19th.

**2005**

1) Stafcolloquium at the University College in Dublin, The hexagonal versus the square lattice, Nov. 2nd.

**2006**

1) Hamburg University, Artin's primitive root conjecture and some related problems,
Apr. 18th.

2) Sudoku seminar (two times, in German), Tag der offenen Tuer, Nov. 25th.

3) Sudoku seminar (in English), MPIM Xmas party 2006, Dec. 14th.