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Search: id:A064819
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| A064819 |
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p(1)*p(2)*...*p(n) - p(n+1)^2, where p(i) = i-th prime. |
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+0
1
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| -7, -19, -19, 89, 2141, 29741, 510149, 9699161, 223092029, 6469692269, 200560488761, 7420738133129, 304250263525361, 13082761331667821, 614889782588488601, 32589158477190041249, 1922760350154212635349, 117288381359406970978781
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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It is known that a(n) > 0 for n >= 4.
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REFERENCES
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S. Bulman-Fleming and E. T. H. Wang, Problem 356, College Math. J., 20 (1989), 265.
J. V. Uspensky and M. A. Heaslet, Elementary Number Theory, McGraw-Hill, NY, 1939.
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CROSSREFS
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Cf. A135734.
Adjacent sequences: A064816 A064817 A064818 this_sequence A064820 A064821 A064822
Sequence in context: A070414 A125257 A052256 this_sequence A102167 A109637 A039513
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KEYWORD
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sign
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AUTHOR
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njas, Oct 23 2001
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