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

Author

Shyam Sunder Gupta, Feb 13 2002

Keywords

• hard
• base
• nonn

Examples

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

Links

• Patrick De Geest, Smallest n-digit pseudoprimes (base 2)
• Index entries for sequences related to pseudoprimes

Crossrefs

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

Extensions

Edited by Charles R Greathouse IV, Nov 01 2009

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