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A062568 Smallest n-digit strong pseudoprimes (in base 2). 9
2047, 15841, 104653, 1004653, 10323769, 100463443, 1002261781, 10000321321, 100004790097, 1000002977551, 10000130243671, 100002236680837, 1000003918690669, 10000008250001701, 100000150553089531, 1000000274500018837, 10000003599249373469 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,1

LINKS

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

EXAMPLE

a(1)=2047 because 2047 is the smallest 4-digit strong pseudoprime to base 2.

CROSSREFS

Cf. A001567, A068216, A067845, A001262, A062852.

Sequence in context: A038462 A001262 A141232 * A180065 A270697 A075954

Adjacent sequences:  A062565 A062566 A062567 * A062569 A062570 A062571

KEYWORD

hard,base,nonn

AUTHOR

Shyam Sunder Gupta, Feb 13 2002

EXTENSIONS

Edited by Charles R Greathouse IV, Nov 01 2009

a(17)-a(20) from Charles R Greathouse IV, Mar 14, 2011

STATUS

approved

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Last modified September 26 05:09 EDT 2017. Contains 292502 sequences.