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Search: id:A005528
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| A005528 |
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Stormer numbers or arc-cotangent irreducible numbers (largest prime factor of n^2 + 1 is >= 2n.
(Formerly M0950)
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+0
8
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| 1, 2, 4, 5, 6, 9, 10, 11, 12, 14, 15, 16, 19, 20, 22, 23, 24, 25, 26, 27, 28, 29, 33, 34, 35, 36, 37, 39, 40, 42, 44, 45, 48, 49, 51, 52, 53, 54, 56, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 69, 71, 74, 77, 78, 79, 80, 81, 82, 84, 85, 86, 87, 88, 89, 90, 92, 94, 95, 96
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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John H. Conway and R. K. Guy, The Book of Numbers, Copernicus Press, p. 246.
J. Todd, A problem on arc tangent relations, Amer. Math. Monthly, 56 (1949), 517-528.
J. Todd, Table of Arctangents. National Bureau of Standards, Washington, DC, 1951, p. 2.
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LINKS
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T. D. Noe, Table of n, a(n) for n = 1..1000
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CROSSREFS
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Cf. A002312.
Adjacent sequences: A005525 A005526 A005527 this_sequence A005529 A005530 A005531
Sequence in context: A104704 A072726 A143070 this_sequence A050015 A063656 A076354
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KEYWORD
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nonn,nice,easy
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AUTHOR
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njas and J. H. Conway (conway(AT)math.princeton.edu)
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