OFFSET
1,1
COMMENTS
Elements are squares of integers in (sqrt(21), sqrt(30)) * sqrt(10)^k without the leading 2 elements for nonnegative k. - David A. Corneth, May 20 2016
LINKS
Nathan Fox, Table of n, a(n) for n = 1..13085
EXAMPLE
56 is a member because 256 = 16^2 is a square.
0 is not a member because 20 is not a square.
MAPLE
t1:=[];
for k from 1 to 20000 do
if issqr(k+2*10^length(k)) then t1:=[op(t1), k]; fi;
od;
t1;
PROG
(Magma) [n: n in [1..15000 ] | IsSquare(Seqint(Intseq(n) cat Intseq(2)))]; // Marius A. Burtea, Mar 21 2019
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved