| 40, 60, 65, 85, 104, 105, 120, 136, 140, 156, 165, 168, 185, 204, 205, 220, 221, 232, 264, 265, 273, 280, 285, 296, 305, 312, 345, 348, 357, 364, 365, 377, 380, 385, 408, 424, 429, 440, 444, 456, 460, 465, 476, 481, 485, 488, 492, 493, 533, 545, 552, 561
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..1000
Eric Weisstein's World of Mathematics, ClassNumber
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MATHEMATICA
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Needs["NumberTheory`NumberTheoryFunctions`"] (*then*) Flatten[Position[ClassNumber/@Range[561], 2, {1}]]
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CROSSREFS
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Cf. A003656, A094612, A094613, A094614.
Sequence in context: A116309 A126816 A035120 this_sequence A052475 A060672 A134216
Adjacent sequences: A094616 A094617 A094618 this_sequence A094620 A094621 A094622
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KEYWORD
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nonn
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AUTHOR
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Eric Weisstein (eric(AT)weisstein.com), May 14, 2004
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