Age, Biography and Wiki

John Selfridge was born on 17 February, 1927 in Ketchikan, Alaska, United States. Discover John Selfridge's Biography, Age, Height, Physical Stats, Dating/Affairs, Family and career updates. Learn How rich is he in this year and how he spends money? Also learn how he earned most of networth at the age of 83 years old?

Popular As N/A
Occupation N/A
Age 83 years old
Zodiac Sign Aquarius
Born 17 February, 1927
Birthday 17 February
Birthplace Ketchikan, Alaska, United States
Date of death (2010-10-31) DeKalb, Illinois, United States
Died Place DeKalb, Illinois, United States
Nationality United States

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John Selfridge Height, Weight & Measurements

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John Selfridge Net Worth

His net worth has been growing significantly in 2023-2024. So, how much is John Selfridge worth at the age of 83 years old? John Selfridge’s income source is mostly from being a successful . He is from United States. We have estimated John Selfridge's net worth, money, salary, income, and assets.

Net Worth in 2024 $1 Million - $5 Million
Salary in 2024 Under Review
Net Worth in 2023 Pending
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Timeline

1927

John Lewis Selfridge (February 17, 1927 – October 31, 2010), was an American mathematician who contributed to the fields of analytic number theory, computational number theory, and combinatorics.

1958

Selfridge received his Ph.D. in 1958 from the University of California, Los Angeles under the supervision of Theodore Motzkin.

1960

Selfridge also developed the Selfridge–Conway discrete procedure for creating an envy-free cake-cutting among three people. Selfridge developed this in 1960, and John Conway independently discovered it in 1993. Neither of them ever published the result, but Richard Guy told many people Selfridge's solution in the 1960s, and it was eventually attributed to the two of them in a number of books and articles.

1962

In 1962, he proved that 78,557 is a Sierpinski number; he showed that, when k = 78,557, all numbers of the form k2 + 1 have a factor in the covering set {3, 5, 7, 13, 19, 37, 73}. Five years later, he and Sierpiński proposed the conjecture that 78,557 is the smallest Sierpinski number, and thus the answer to the Sierpinski problem. A distributed computing project called Seventeen or Bust is currently trying to prove this statement, as of April 2017 only five of the original seventeen possibilities remain.

1964

In 1964, Selfridge and Alexander Hurwitz proved that the 14th Fermat number 2 2 14 + 1 {\displaystyle 2^{2^{14}}+1} was composite. However, their proof did not provide a factor. It was not until 2010 that the first factor of the 14th Fermat number was found.

1971

Selfridge served on the faculties of the University of Illinois at Urbana-Champaign and Northern Illinois University from 1971 to 1991 (retirement), chairing the Department of Mathematical Sciences 1972–1976 and 1986–1990. He was executive editor of Mathematical Reviews from 1978 to 1986, overseeing the computerization of its operations. He was a founder of the Number Theory Foundation, which has named its Selfridge prize in his honour.

1975

In 1975 John Brillhart, Derrick Henry Lehmer, and Selfridge developed a method of proving the primality of p given only partial factorizations of p − 1 and p + 1. Together with Samuel Wagstaff they also all participated in the Cunningham project.

2015

where fk is the kth Fibonacci number, then p is a prime number, and he offered $500 for an example disproving this. He also offered $20 for a proof that the conjecture was true. The Number Theory Foundation will now cover this prize. An example will actually yield you $620 because Samuel Wagstaff offers $100 for an example or a proof, and Carl Pomerance offers $20 for an example and $500 for a proof. Selfridge requires that a factorization be supplied, but Pomerance does not. The conjecture was still open August 23, 2015. The related test that fp−1 ≡ 0 (mod p) for p ≡ ±1 (mod 5) is false and has e.g. a 6-digit counterexample. The smallest counterexample for +1 (mod 5) is 6601 = 7 × 23 × 41 and the smallest for −1 (mod 5) is 30889 = 17 × 23 × 79. It should be known that a heuristic by Pomerance may show this conjecture is false (and therefore, a counterexample should exist).