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A028813 Nonsquares mod 100. 1
2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 22, 23, 26, 27, 28, 30, 31, 32, 33, 34, 35, 37, 38, 39, 40, 42, 43, 45, 46, 47, 48, 50, 51, 52, 53, 54, 55, 57, 58, 59, 60, 62, 63, 65, 66, 67, 68, 70, 71, 72, 73, 74, 75, 77, 78, 79, 80, 82, 83, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 97, 98, 99 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Complement of A010461. Numbers n such that k^2 == n (mod 100) has no solution. - Altug Alkan, Dec 10 2015

LINKS

Table of n, a(n) for n=1..78.

MATHEMATICA

n = 100; Complement[Range[0, n - 1], Union@ Array[PowerMod[#, 2, n] &, {100}]] (* Michael De Vlieger, Dec 10 2015 *)

PROG

(PARI) v=vector(100, n, n^2%100); v=vecsort(v); for(i=1, 99, if (!vecsearch(v, i), print1(i, ", "))) \\ Derek Orr, Sep 25 2014

(PARI) for (n=0, 99, if (!issquare(Mod(n, 100)), print1(n, ", ")); ); \\ Michel Marcus, Dec 10 2015

(Scala) (0 to 99).diff((1 to 100).map(n => (n * n) % 100)) // Alonso del Arte, Dec 25 2019

CROSSREFS

Cf. A000037 (nonsquares).

Cf. A010461.

Sequence in context: A283296 A028797 A028773 * A158276 A028793 A028753

Adjacent sequences:  A028810 A028811 A028812 * A028814 A028815 A028816

KEYWORD

nonn,fini,full,easy

AUTHOR

N. J. A. Sloane

EXTENSIONS

More terms to show full sequence from Derek Orr, Sep 25 2014

STATUS

approved

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Last modified May 30 18:07 EDT 2020. Contains 334728 sequences. (Running on oeis4.)