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

3,1

Links

Table of n, a(n) for n=3..19.

Patrick De Geest, Smallest n-digit Pseudoprimes

Index entries for sequences related to pseudoprimes

Example

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

Crossrefs

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

Sequence in context: A216364 A063844 A265684 * A057942 A230488 A228575

Adjacent sequences: A067842 A067843 A067844 * A067846 A067847 A067848

Keyword

hard,nonn,base

Author

Shyam Sunder Gupta, Feb 14 2002

Extensions

More terms from Farideh Firoozbakht, Jan 11 2007

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

Status

approved