A303371 Numbers k such that prime(k)^k + 2 is prime.

2, 3, 5, 309

Offset

1,1

Links

Table of n, a(n) for n=1..4.

Maple

select( n-> isprime(ithprime(n)^n + 2), [$(1..333)]) # M. F. Hasler, May 21 2018

Prog

(PARI) select( is(n)=ispseudoprime(prime(n)^n+2), [1..333])
L=500; for(n=1, oo, is(n)&&print1(n", "); n<L||print1([n])||L+=500)

Crossrefs

Cf. A304856.

Sequence in context: A338262 A042579 A033090 * A362182 A046474 A056146

Adjacent sequences: A303368 A303369 A303370 * A303372 A303373 A303374

Keyword

nonn,hard,more

Author

M. F. Hasler, May 19 2018

Status

approved