A010410 Squares mod 49.
0, 1, 2, 4, 8, 9, 11, 15, 16, 18, 22, 23, 25, 29, 30, 32, 36, 37, 39, 43, 44, 46
Offset: 1
Programs
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Mathematica
Union[PowerMod[Range[49], 2, 49]] (* Alonso del Arte, Jan 07 2020 *)
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Sage
[quadratic_residues(49)] # Zerinvary Lajos, May 24 2009
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Scala
(1 to 49).map(n => n * n % 49).toSet.toSeq.sorted // Alonso del Arte, Jan 07 2020
Formula
a(n) = a(n-1) + a(n-3) - a(n-4) for 5 < n <= 22. - Chai Wah Wu, Jan 30 2018