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A067845 Largest n-digit pseudoprime (to base 2). 7

%I #17 Jun 30 2019 10:42:05

%S 645,8911,93961,997633,9995671,99971821,999828727,9999109081,

%T 99983971501,999986341201,9999946514845,99999856404001,

%U 999994510007533,9999999191658001,99999984319096601,999999995115616561,9999999995077192591

%N Largest n-digit pseudoprime (to base 2).

%H Patrick De Geest, <a href="http://www.worldofnumbers.com/won125.htm">Smallest n-digit Pseudoprimes</a>

%H <a href="/index/Ps#pseudoprimes">Index entries for sequences related to pseudoprimes</a>

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

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

%K hard,nonn,base

%O 3,1

%A _Shyam Sunder Gupta_, Feb 14 2002

%E More terms from _Farideh Firoozbakht_, Jan 11 2007

%E a(17)-a(19) from _Amiram Eldar_, Jun 30 2019

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)