OFFSET
1,1
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
EXAMPLE
59 and floor(sqrt(2)*59)=83 are primes.
MAPLE
filter:= proc(p) isprime(p) and isprime(floor(sqrt(2)*p)) end proc:
select(filter, [2, seq(i, i=3..3000, 2)]); # Robert Israel, Sep 04 2019
MATHEMATICA
(* primes that when multiplied by Sqrt[2] give new primes*) digits=1200 a=Delete[Union[Table[If[PrimeQ[Floor[Prime[n]*Sqrt[2]]]==True, Prime[n], 0], {n, 1, digits}]], 1]
CROSSREFS
KEYWORD
nonn
AUTHOR
Roger L. Bagula, Oct 11 2004
STATUS
approved