A254519 Largest n-digit pseudoprime to base 3.

91, 949, 8911, 97567, 997633, 9959413, 99971821, 999271891, 9999326731, 99997244929, 999989423051, 9999899578441, 99999695823301, 999999050050321, 9999997295187859, 99999997019370001

Offset

2,1

Links

Table of n, a(n) for n=2..17.

Prog

(PARI) for(n=2, 20, k=10^n; while(ispseudoprime(k) || Mod(3, k)^(k-1)!=1, k--); print1(k, ", "))

Crossrefs

Cf. A005935, A067845.

Sequence in context: A085952 A129255 A093291 * A185375 A036526 A170955

Adjacent sequences: A254516 A254517 A254518 * A254520 A254521 A254522

Keyword

nonn,hard,base,more

Author

Felix Fröhlich, Jan 31 2015

Status

approved