A375620 - OEIS

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A375620

Numbers k such that (20^k - 3^k)/17 is prime.

0

2, 43, 1723, 2971, 3257, 12263, 38933

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OFFSET

1,1

COMMENTS

All terms must be prime.

a(8) > 10^5.

LINKS

Table of n, a(n) for n=1..7.

OEIS Wiki, Primes of the form (a^n+b^n)/(a+b) and (a^n-b^n)/(a-b)

EXAMPLE

a(1) = 2 corresponds to the prime number 23.

PROG

(PARI) is(k) = ispseudoprime((20^k - 3^k)/17)

CROSSREFS

Cf. A028491, A057468, A128032, A059801, A121877, A128024, A128025, A128026, A128027, A128028, A128029, A128030, A128031, A128032.

Sequence in context: A364556 A188683 A119775 * A088466 A357279 A362762

Adjacent sequences: A375617 A375618 A375619 * A375621 A375622 A375623

KEYWORD

hard,more,nonn

AUTHOR

William Dean, Aug 21 2024

STATUS

approved