A165696 a(n) is the smallest number m such that the n numbers A004086(m^k) (digit reversal of m^k) for 0 < k < n+1 are all primes.

2, 14, 325, 3244, 3244, 110218462, 32149366346, 10212002596432

Offset

1,1

Links

Table of n, a(n) for n=1..8.

Example

Both numbers A004086(14) = 41 and A004086(14^2) = 691 are primes and 14 is the smallest number with this property so a(2) = 14.

Crossrefs

Cf. A004086, A118212, A118213, A165697, A165698, A165699.

Sequence in context: A277035 A078675 A133130 * A180605 A358597 A094155

Adjacent sequences: A165693 A165694 A165695 * A165697 A165698 A165699

Keyword

nonn,base,hard,more

Author

Farideh Firoozbakht, Sep 29 2009

Extensions

a(8) from Matthias Baur, Mar 03 2021

Status

approved