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On-Line Encyclopedia of Integer Sequences    N. J. A. Sloane (New Jersey)
Sequences I have authored
All my contributions

Jens Kruse Andersen (Denmark)
Largest Consecutive Factorizations

Henri Lifchitz (France)
Probable Primes (PRPs): See Top discoverers or to view all of the PRPs I have found, click here and select my name next to "Find by discoverer"
FactoProth and PrimoProth records
BiTwin records

Darío Alpern (Argentina)
Base-2 2-brilliant numbers: English or Spanish
Base-10 4-brilliant numbers: English or Spanish
Base-10 3-brilliant numbers: English or Spanish
Factors of Modified Fermat Numbers: English or Spanish

Prime Curios (University of Tennessee at Martin)
Largest known probable prime decimal expansion of the square root of 2
Largest known cube with digits which are all primes

Number Recreations    Shyam Sunder Gupta (India)
Can You Find? (CYF NO. 21, 28, 32, 33, 35 and 37)

World Integer Factorization Center    Hisanori Mishima (Japan)
Decimal expansion of pi
Decimal expansion of Euler gamma
Smarandache consecutive prime sequence numbers
Reverse Smarandache consecutive prime sequence numbers

Aliquot Sequences from the Trenches    Clifford Stern (California)
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Aliquot Sequences with leading term < 10000    Christophe Clavier (France)
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1464 to 9852 (I've worked on sequences 2484, 3408, 3564 and 3774)

Largest Known Primes (University of Tennessee at Martin)
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Primes and Strong Pseudoprimes of the form xy + yx    Paul Leyland (UK)
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D La Pierre Ballard
Twin Prime Clusters of Five Twins within 39 Numbers (5TP39)

Jim Howell's Math Page (California)
Factorizations of concatenated prime numbers (Smarandache consecutive prime sequence)
Factorizations of concatenated odd numbers (Smarandache consecutive odd sequence)

MathPuzzle.com    Ed Pegg Jr.
Largest Consecutive Factorizations


Main page


Donovan Johnson