|
Search: id:A005528
|
|
|
| A005528 |
|
Stormer numbers or arc-cotangent irreducible numbers (largest prime factor of n^2 + 1 is >= 2n.
(Formerly M0950)
|
|
+0
8
|
|
| 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)
|
|
|
OFFSET
|
1,2
|
|
|
REFERENCES
|
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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.
|
|
LINKS
|
T. D. Noe, Table of n, a(n) for n = 1..1000
|
|
CROSSREFS
|
Cf. A002312.
Sequence in context: A072726 A153242 A143070 this_sequence A050015 A153218 A063656
Adjacent sequences: A005525 A005526 A005527 this_sequence A005529 A005530 A005531
|
|
KEYWORD
|
nonn,nice,easy
|
|
AUTHOR
|
N. J. A. Sloane (njas(AT)research.att.com) and J. H. Conway (conway(AT)math.princeton.edu)
|
|
|
Search completed in 0.002 seconds
|
