A188173 - OEIS

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A188173

Squarefree numbers m such that the equation x^2 == m (mod 10^k) has solutions for all k > 0.

1

41, 89, 129, 161, 201, 209, 241, 249, 281, 321, 329, 401, 409, 449, 481, 489, 521, 561, 569, 601, 609, 641, 649, 681, 689, 721, 761, 769, 809, 849, 881, 889, 921, 929, 969, 1001, 1009, 1041, 1049, 1081, 1121, 1129, 1169, 1201, 1209, 1241, 1249, 1281, 1289

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OFFSET

1,1

COMMENTS

The minimal solutions for m=41 are in sequence A187719.

LINKS

Table of n, a(n) for n=1..49.

MATHEMATICA

Rest[Select[Union[Mod[Range[10000]^2, 10000]], OddQ[#] && SquareFreeQ[#] &]]

CROSSREFS

Sequence in context: A282533 A199983 A241081 * A142411 A139924 A155572

Adjacent sequences: A188170 A188171 A188172 * A188174 A188175 A188176

KEYWORD

nonn

AUTHOR

T. D. Noe, Mar 23 2011

STATUS

approved