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Search: id:A142959
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| A142959 |
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Numbers n such that both (n!)^2 + n! + 1 and (n!)^2 + 1 are prime. |
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+0
2
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OFFSET
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1,2
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COMMENT
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For the numbers of digits of the associated primes, see A142960.
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REFERENCES
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J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 76, pp 26, Ellipses, Paris 2008.
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FORMULA
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A046029 INTERSECT A051856. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 08 2008]
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CROSSREFS
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Sequence in context: A066776 A115901 A073325 this_sequence A037395 A009496 A008405
Adjacent sequences: A142956 A142957 A142958 this_sequence A142960 A142961 A142962
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KEYWORD
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nonn
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AUTHOR
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Lekraj Beedassy (blekraj(AT)yahoo.com), Jul 13 2008
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