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A055550
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Number of Poulet numbers (or pseudoprimes to base 2, A001567) less than 10^n.
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0
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0, 0, 3, 22, 78, 245, 750, 2057, 5597, 14884, 38975, 101629, 264239, 687007, 1801533, 4744920, 12604009, 33763684, 91210364
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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REFERENCES
| J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 245, pp 68, Ellipses, Paris 2008. - Lekraj Beedassy (blekraj(AT)yahoo.com), Jul 20 2008
W. F. Galway, "The pseudoprimes below to 2^64", http://oldweb.cecm.sfu.ca/pseudoprime/psp-search-slides.pdf.
W. F. Galway, Database of pseudoprimes up to 10^15, http://oldweb.cecm.sfu.ca/pseudoprime/.
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LINKS
| Eric Weisstein's World of Mathematics, Poulet Number
Eric Weisstein's World of Mathematics, Pseudoprime
Jan Feitsma and William Galway, Tables of pseudoprimes and related data
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CROSSREFS
| Cf. A001567, A055552.
Sequence in context: A178492 A005288 A143166 * A075204 A106150 A135836
Adjacent sequences: A055547 A055548 A055549 * A055551 A055552 A055553
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KEYWORD
| nonn,more
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AUTHOR
| Eric Weisstein (eric(AT)weisstein.com)
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EXTENSIONS
| a(14) and a(15) computed by William F. Galway and communicated by Arthur Livingstone (arthur.livingstone(AT)gmail.com), Apr 10 2007
Edited by N. J. A. Sloane (njas(AT)research.att.com), Feb 01 2009 at the suggestion of Charles R Greathouse IV.
a(14)-a(15) recomputed (were missing) and a(16)-a(19) added by Charles R Greathouse, Jan 28 2011, based on the calculations of Jan Feitsma.
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