A165696 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

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

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

(list; graph; refs; listen; history; text; internal format)

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