A366680 Numbers k such that (34^k + 1)/35 is prime.

3, 294277, 735439

Offset

1,1

Comments

These are the repunits in base -34.

Links

Table of n, a(n) for n=1..3.

Paul Bourdelais, A Generalized Repunit Conjecture

Example

3 is a term since (34^3 + 1)/35 = 1123 is a prime.

Mathematica

Do[ If[ PrimeQ[ (34^n+1)/35], Print[n]], {n, 0, 18000}]

Prog

(PARI) is(n) = my(q=(34^n+1)/35); (denominator(q)==1) && ispseudoprime(q);

Crossrefs

Cf. A185230.

Sequence in context: A339776 A033982 A326618 * A154824 A261541 A309225

Adjacent sequences: A366677 A366678 A366679 * A366681 A366682 A366683

Keyword

nonn,bref,hard,more

Author

Paul Bourdelais, Oct 16 2023

Status

approved