## Hans Riesel

- <riesel@nada.kth.se>
- Phone number: +46 8-790 8193
- Address: NADA, KTH, S-100 44 Stockholm, Sweden

- Home address: Måbärsstigen 2, S-16565 Hässelby, Sweden
- Home phone: +46 8-38 59 83

I was born in Stockholm in 1929. I have studied mathematics and numerical
analysis at the University of Stockholm. My carrier with computers started
back in 1953 with Sweden's first electronic computer, the BESK (Binary
Electronic Sequence Calculator), a variant of the so-called Princeton
machine. From 1960 to 1963 I served as head of the math department of the
Swedish Board for Computing Machinery, an organization which was swallowed
up by SAFAD, the Swedish Agency for Administrative Development. I served
the SAFAD until 1969, when I was appointed lecturer in numerical analysis
at the Royal Institute of Technology in Stockholm.
My scientific work has mainly been performed in Computational Mathematics.
I have published one major book, "Prime Numbers and Computer Methods
for Factorization", Birkhäuser, Boston 1985, 2nd ed. 1994.

My scientific interests are: Prime numbers and
factorization,
Fermat numbers,
Mersenne numbers,
Fermat's congruence,
Bernoulli numbers,
Continued fractions,
Infinite series,
Computer programming,
Various,
Didactics.

My privat interests are: Boating.

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