A062568 a(n) is the smallest n-digit strong pseudoprime (in base 2).

2047, 15841, 104653, 1004653, 10323769, 100463443, 1002261781, 10000321321, 100004790097, 1000002977551, 10000130243671, 100002236680837, 1000003918690669, 10000008250001701, 100000150553089531, 1000000274500018837, 10000003599249373469

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: A367230 A361256 A360184 * 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