OFFSET
1,2
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
EXAMPLE
9 is in the sequence since (9*9)^(1/4) = 3 (an integer), with 1 <= 9 <= 9.
MAPLE
filter:= proc(n) local F, x, t;
F:= ifactors(n)[2];
x:= mul(t[1]^(-t[2] mod 4), t=F);
x <= n
end proc:
select(filter, [$1..1000]); # Robert Israel, Dec 29 2020
MATHEMATICA
Table[If[Sum[1 - Ceiling[(n*k)^(1/4)] + Floor[(n*k)^(1/4)], {k, n}] > 0, n, {}], {n, 500}] // Flatten
CROSSREFS
KEYWORD
nonn
AUTHOR
Wesley Ivan Hurt, Dec 27 2020
STATUS
approved