Hans Riesel

Hans Riesel (born May 28, 1929 in Stockholm ; † December 21, 2014 ) was a Swedish mathematician who dealt with numerical mathematics and algorithmic number theory.

Life

Hans Riesel studied mathematics and numerical analysis at Stockholm University . In the 1950s he was involved in the programming of the first Swedish electronic computer BESK (Binary Electronic Sequence Calculator), which was in operation from 1953 to 1966 and supported by the Swedish computer company (SBEK, Swedish Board of Computing Machinery) founded after the war has been. 1960 to 1963 he headed the mathematics department of the SBEK and was then in its successor organization SAFAD until 1969. After that he was professor for numerical analysis at the Technical University in Stockholm .

In 1957 he found the 18th Mersenne prime .

The trickle numbers are named after him, of which he discovered the probably smallest trickle number in 1956 with 509.203 (the question of the smallest trickle number is the trickle problem, which is open). Riesel also showed that there are an infinite number of Riesel numbers.

Publications

Prime Numbers and Computer Methods for Factorization. Birkhäuser, Stuttgart 1985, ISBN 3-7643-3291-3 . (2nd edition 1994, ISBN 3-7643-3743-5 ).

Web links

Official website at nada.kth.se
Obituary
Factors found by Riesel and Anders Björn from generalized Fermat factors

Remarks

↑ At the end of the 1950s he was a co-developer of the assembler Alphacode
↑ It used vacuum tubes and was modeled on the IAS computer by John von Neumann at the Institute for Advanced Study in Princeton. At times it was the fastest computer in the world. It was developed by Conny Palm, who died in 1951, and his successor Stig Comét, who had already worked on a relay computer (BARK) as a predecessor.

personal data
SURNAME	Riesel, Hans
BRIEF DESCRIPTION	Swedish mathematician
DATE OF BIRTH	May 28, 1929
PLACE OF BIRTH	Stockholm
DATE OF DEATH	December 21, 2014

[1] At the end of the 1950s he was a co-developer of the assembler Alphacode

[2] It used vacuum tubes and was modeled on the IAS computer by John von Neumann at the Institute for Advanced Study in Princeton. At times it was the fastest computer in the world. It was developed by Conny Palm, who died in 1951, and his successor Stig Comét, who had already worked on a relay computer (BARK) as a predecessor.