OFFSET
1,1
COMMENTS
The actual squares are listed in A277948. - M. F. Hasler, Nov 12 2017
Includes 2*10^n+10^m for all n <> m. - Robert Israel, Nov 13 2017
For any term of q digits, the first m digits don't exceed (2 * 10^m - 2) / 3 = 666..66 (m 6's) for 1 <= m <= q. - David A. Corneth, Nov 13 2017
A term a(n) is in the sequence if and only if a(n)*10^k is in the sequence, for all k >= 0. If a(n) = (x*10^k + y)*10^m with 2xy < 10^k, then (y*10^k+x)*10^m' is also in the sequence, for all m'. - M. F. Hasler, Nov 13 2017
LINKS
Colin Barker, Table of n, a(n) for n = 1..1000
FORMULA
MAPLE
select(n -> max(convert(n^2, base, 10))=4, [$1..10000]); # Robert Israel, Nov 13 2017
PROG
(PARI) L=List(); for(n=1, 10000, if(vecmax(digits(n^2))==4, listput(L, n))); Vec(L)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Colin Barker, Nov 06 2016
STATUS
approved