OFFSET
0,1
COMMENTS
We also have a(49) = 39999999984, a(54) = 3999999999840, a(59) = 3999999999984. - Giovanni Resta, Apr 18 2020
LINKS
Giovanni Resta, Table of n, a(n) for n = 0..46
EXAMPLE
Square root of first terms: 2, 1.0, 3.16, 1.732, 7.9372, 11.3578, ...
PROG
(PARI) a(n) = {my(g=10^n, v); for(k=1, oo, v=digits(floor(sqrt(k)*g))[1..n+1]; if(v[n+1]%2==0 && setintersect([1, 3, 5, 7, 9], v=Set(v[1..n]))==v, return(k))); }
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Jinyuan Wang, Apr 16 2020
EXTENSIONS
Terms a(30) and beyond from Giovanni Resta, Apr 18 2020
STATUS
approved