A004203 Numbers n such that 54*10^n + 1 is prime.

1, 3, 5, 11, 47, 79, 275, 839, 1877, 3399, 5371, 6671, 30659, 43575

Offset

1,2

Comments

No more terms through 10^5.

Links

Table of n, a(n) for n=1..14.

Prog

(PARI) is(n)=ispseudoprime(54*10^n+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A059242 A175173 A268510 * A201473 A088884 A328381

Adjacent sequences: A004200 A004201 A004202 * A004204 A004205 A004206

Keyword

nonn

Author

R. K. Guy

Extensions

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

Status

approved