The number of n-digit numbers requiring 4 nonzero squares in their representation as sum of squares.
A180347
The number of n-digit numbers requiring 4 nonzero squares in their representation as sum of squares.
Terms
- a(0) =1a(1) =14a(2) =150a(3) =1500a(4) =14999a(5) =150000a(6) =1499999a(7) =15000000a(8) =149999998a(9) =1500000001a(10) =14999999999a(11) =149999999999
External references
- oeis: A180347