A037041 Number of quadratic residues mod n for some n (A000224 sorted and duplicates removed).

1, 2, 3, 4, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 18, 19, 20, 21, 22, 23, 24, 27, 28, 30, 31, 32, 33, 34, 36, 37, 38, 40, 42, 44, 45, 46, 48, 49, 51, 52, 53, 54, 55, 56, 57, 60, 62, 63, 64, 66, 68, 69, 70, 72, 74, 75, 76, 77, 79, 80, 81, 82, 84, 87, 88, 90, 91, 92, 93, 96, 97, 98

Offset

1,2

Links

Robert Israel, Table of n, a(n) for n = 1..1802

Maple

N:= 100: # for terms <= N
S:= {}:
for i from 1 to N^2 do
  v:= A000224(i);
  if v <= N then
    S:= S union {v}
  fi;
od:
sort(convert(S, list)); # Robert Israel, Jul 20 2025

Crossrefs

Sequence in context: A004776 A187945 A137409 * A048263 A141451 A285211

Adjacent sequences: A037038 A037039 A037040 * A037042 A037043 A037044

Keyword

nonn

Author

David W. Wilson

Status

approved