A067072 a(n) = smallest square m^2 such that the sum of the digits of m^2 is equal to n^2.
0, 1, 4, 9, 169, 4489, 69696, 2778889, 277788889, 8998988769, 2699997789889, 898999897988929, 498999778899898896, 969988797999759789889, 1679898987989978888999689
Offset: 0
Examples
a(5) = 4489 = 67^2 as it is the smallest square whose digit sum = 25 = 5^2.
Formula
a(n) = A061912(n)^2.
Extensions
More terms from Jason Earls, Jan 09 2002
a(11)-a(14) from Donovan Johnson, Jul 10 2012
a(0)=0 prepended by Seiichi Manyama, Aug 12 2017