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Numbers having a unique representation as sum of a squarefree number and a square.
2

%I #6 Feb 16 2025 08:32:50

%S 2,3,4,5,8,9,25,29,61

%N Numbers having a unique representation as sum of a squarefree number and a square.

%C A085263(a(n))=1; are there more?

%C No more terms through 625000000. - _Ryan Propper_, Jan 05 2008

%H Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/SquareNumber.html">Square Numbers.</a>

%H Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Squarefree.html">Squarefree</a>

%Y Cf. A085265, A085267.

%K nonn,more,hard,changed

%O 1,1

%A _Reinhard Zumkeller_, Jun 23 2003