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REFERENCES
| A. H. Beiler, Recreations in the Theory of Numbers, Dover, NY, 1964, p. 9.
L. E. Dickson, History of the Theory of Numbers. Carnegie Institute Public. 256, Washington, DC, Vol. 1, 1919; Vol. 2, 1920; Vol. 3, 1923, see vol. 1, p. 54.
Julian Havil, Gamma, Exploring Euler's Constant, Princeton University Press, Princeton and Oxford, 2003, page 92.
I. Kaplansky, The challenges of Fermat, Wallis and Ozanam (and several related challenges): II. Fermat's second challenge, Preprint, 2002.
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EXTENSIONS
| More terms from David W. Wilson (davidwwilson(AT)comcast.net). His search was complete only through a(2) = 43098. - Sep 15 1996.
Kaplansky gives two further numbers with this property: 2597942466059820 and 6847610254216117540. The first is probably new and the second is in Dickson.
I. Kaplansky and W. Jagy have verified that there are no other terms below 9*10^11. - Oct 13, 2002
The keyword "more" refers to the fact that there may be missing terms in the sequence above 9 * 10^11.
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