A004203 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A004203

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

0

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

(list; graph; refs; listen; history; text; internal format)

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

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