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URL: https://oeis.org/A276203

⇱ A276203 - OEIS

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A276203

Numbers k such that k^9 + 9^k is prime.

0

2, 76, 122, 422, 2300, 5090, 7166, 58046, 91382, 234178, 314738

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OFFSET

1,1

COMMENTS

Numbers k such that A185277(k) is prime.

LINKS

Table of n, a(n) for n=1..11.

Hans Havermann, Indices of A094133 in A076980.

Andrey V. Kulsha, Factorizations of x^y + y^x for 1 < y < x < 151.

P. Leyland, Primes and Strong Pseudoprimes of the form x^y + y^x.

EXAMPLE

2 is a term of the sequence, because A185277(2) = 593 is prime.

PROG

(PARI) is(n) = ispseudoprime(n^9+9^n)

CROSSREFS

Cf. A064539, A185277, A253471.

Sequence in context: A282966 A351433 A351376 * A324216 A198704 A198623

Adjacent sequences: A276200 A276201 A276202 * A276204 A276205 A276206

KEYWORD

nonn,hard,more

AUTHOR

Felix Fröhlich, Aug 27 2016

STATUS

approved