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A175738
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Sizes of successive increasing gaps between 2-pseudoprimes.
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4
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220, 460, 756, 780, 1140, 1356, 1496, 2000, 3050, 3580, 4532, 4784, 5220, 7140, 12132, 20412, 20650, 22320, 26076, 39424, 42392, 65740, 81252, 87698, 137104, 164448, 203506, 370396, 484140, 491526, 506940, 667908, 682820, 777224, 951114, 1201538
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OFFSET
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1,1
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COMMENTS
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Rotkiewicz proves that a(n) < A175736(n)^2, and that the exponent can be replaced by 1 + epsilon for large enough n.
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REFERENCES
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A. Rotkiewicz, "Les intervalles contenants les nombres pseudopremiers", Rendiconti del Circolo Matematico di Palermo, Series 2, 14 (1965), pp. 278-280.
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LINKS
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FORMULA
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CROSSREFS
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KEYWORD
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nonn,nice
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AUTHOR
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STATUS
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approved
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