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A062568
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a(n) is the smallest n-digit strong pseudoprime (in base 2).
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9
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2047, 15841, 104653, 1004653, 10323769, 100463443, 1002261781, 10000321321, 100004790097, 1000002977551, 10000130243671, 100002236680837, 1000003918690669, 10000008250001701, 100000150553089531, 1000000274500018837, 10000003599249373469
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history;
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OFFSET
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4,1
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LINKS
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Table of n, a(n) for n=4..20.
Patrick De Geest, Smallest n-digit pseudoprimes (base 2)
Index entries for sequences related to pseudoprimes
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EXAMPLE
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a(1)=2047 because 2047 is the smallest 4-digit strong pseudoprime to base 2.
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CROSSREFS
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Cf. A001567, A068216, A067845, A001262, A062852.
Sequence in context: A141232 A361256 A360184 * A180065 A270697 A075954
Adjacent sequences: A062565 A062566 A062567 * A062569 A062570 A062571
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KEYWORD
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hard,base,nonn
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AUTHOR
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Shyam Sunder Gupta, Feb 13 2002
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EXTENSIONS
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Edited by Charles R Greathouse IV, Nov 01 2009
a(17)-a(20) from Charles R Greathouse IV, Mar 14 2011
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STATUS
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approved
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