1,2
No more terms through 10^5.
Table of n, a(n) for n=1..14.
(PARI) is(n)=ispseudoprime(54*10^n+1) \\ Charles R Greathouse IV, Jun 13 2017
Sequence in context: A059242 A175173 A268510 * A201473 A088884 A328381
Adjacent sequences: A004200 A004201 A004202 * A004204 A004205 A004206
nonn
R. K. Guy
a(1)-a(9) computed by Cletus Emmanuel (cemmanu(AT)uvi.edu) and Richard Pinch
a(10)-a(14) from Cletus Emmanuel (cemmanu(AT)yahoo.com), submitted by Ray Chandler, Feb 15 2005
approved