A067845 Largest n-digit pseudoprime (to base 2).

645, 8911, 93961, 997633, 9995671, 99971821, 999828727, 9999109081, 99983971501, 999986341201, 9999946514845, 99999856404001, 999994510007533, 9999999191658001, 99999984319096601, 999999995115616561, 9999999995077192591

Offset: 3

Author

Shyam Sunder Gupta, Feb 14 2002

Keywords

• hard
• nonn
• base

Examples

			a(2)=8911, so largest pseudoprime (base 2) of 4 digits is 8911.
		

Links

• Patrick De Geest, Smallest n-digit Pseudoprimes
• Index entries for sequences related to pseudoprimes

Crossrefs

Cf. A001567, A068216, A001262, A062568, A062852.

Extensions

More terms from Farideh Firoozbakht, Jan 11 2007

a(17)-a(19) from Amiram Eldar, Jun 30 2019