# Fame.am profile — machine-readable export
# Canonical URL: https://fame.am/person/hans-riesel
# Generated: 2026-08-13T09:48:52.128Z

schema: https://schema.org/Person
url: "https://fame.am/person/hans-riesel"
name: "Hans Riesel"
slug: "hans-riesel"
description: "Hans Ivar Riesel was a Swedish mathematician who discovered the 18th Mersenne prime in 1957 using the computer BESK: 23217-1, comprising 969 digits. He held the record for the largest known prime from 1957 to 1961, when Alexander Hurwitz discovered a larger one. Riesel also discovered the Riesel numbers as well as developing the Lucas–Lehmer–Riesel test. After having worked at the Swedish Board for Computing Machinery, he was awarded his Ph.D. from Stockholm University in 1969 for his thesis Contributions to numerical number theory, and in the same year joined the Royal Institute of Technology as a senior lecturer and associate professor."
tagline: "Swedish mathematician (1929-2014)"
gender: "male"
country:
  name: "Sweden"
  isoCode: "SE"
category:
  name: "Academics"
  slug: "academics"
profileType:
  name: "Academic"
  slug: "academic"
  entityType: "https://www.wikidata.org/entity/Q39631"
birthDate: "1929-05-28"
deathDate: "2014-12-21"
livingStatus: "DECEASED"
scores:
  popularity:           37.43
  momentum:             0
  historical:           6.737293333333334
  currentAttention:     0
  sourceConfidence:     39.99999999999999
  profileCompleteness:  55
  trendDirection:       "FALLING"
ranks:
  global:   null
  country:  null
  category: null
sources:
  - url: "https://sv.wikipedia.org/wiki/Hans_Riesel"
    title: "Hans Riesel"
    type:  "WIKIPEDIA"
  - url: "https://de.wikipedia.org/wiki/Hans_Riesel"
    title: "Hans Riesel"
    type:  "WIKIPEDIA"
  - url: "https://en.wikipedia.org/wiki/Hans_Riesel"
    title: "Hans Riesel"
    type:  "WIKIPEDIA"
  - url: "https://fr.wikipedia.org/wiki/Hans_Riesel"
    title: "Hans Riesel"
    type:  "WIKIPEDIA"
  - url: "https://it.wikipedia.org/wiki/Hans_Riesel"
    title: "Hans Riesel"
    type:  "WIKIPEDIA"
  - url: "https://ja.wikipedia.org/wiki/%E3%83%8F%E3%83%B3%E3%82%B9%E3%83%BB%E3%83%AA%E3%83%BC%E3%82%BC%E3%83%AB"
    title: "ハンス・リーゼル"
    type:  "WIKIPEDIA"
  - url: "https://nl.wikipedia.org/wiki/Hans_Riesel"
    title: "Hans Riesel"
    type:  "WIKIPEDIA"
  - url: "https://www.wikidata.org/wiki/Q707991"
    title: "Wikidata"
    type:  "WIKIDATA"

# bio (long form, separated for readability)
bio: |
  Imported from discovery source: wikidata-dump