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Search: id:A008784
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| A008784 |
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Numbers n such that sqrt(-1) mod n exists; or, numbers n that are primitively represented by x^2+y^2. |
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21
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| 1, 2, 5, 10, 13, 17, 25, 26, 29, 34, 37, 41, 50, 53, 58, 61, 65, 73, 74, 82, 85, 89, 97, 101, 106, 109, 113, 122, 125, 130, 137, 145, 146, 149, 157, 169, 170, 173, 178, 181, 185, 193, 194, 197, 202, 205, 218, 221, 226, 229, 233, 241, 250, 257, 265, 269, 274, 277, 281, 289
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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B. C. Berndt & R. A. Rankin, Ramanujan: Letters and Commentary, see p. 176; AMS Providence RI 1995.
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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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MAPLE
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with(numtheory); [seq(mroot(-1, 2, p), p=1..300)];
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CROSSREFS
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Cf. A001481, A022544, A020893, A037942, A034023-, A057756.
Indices of nonzero entries in A076948. This follows from G. H. Hardy and E. M. Wright, An Introduction to the Theory of Numbers, 5th ed., Oxford Univ. Press, 1979, Ch. 20.2-3. - Amarnath Murthy and Vladeta Jovovic, Oct 20, 2002
Cf. A045673.
Sequence in context: A099261 A103215 A037942 this_sequence A020893 A003814 A031396
Adjacent sequences: A008781 A008782 A008783 this_sequence A008785 A008786 A008787
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KEYWORD
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nonn
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AUTHOR
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njas, Olivier Gerard (ogerard(AT)ext.jussieu.fr)
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EXTENSIONS
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Checked by T. D. Noe, Apr 19 2007
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