OFFSET
1
COMMENTS
LINKS
Michael De Vlieger, Table of n, a(n) for n = 1..11325 (rows 1 <= n <= 150)
Michael De Vlieger, Image of rows 1 <= n <= 2310
EXAMPLE
Table begins:
0;
0, 0;
0, 0, 0;
0, 0, 0, 0;
0, 0, 0, 0, 0;
0, 0, 0, 0, 0, 0;
0, 0, 0, 0, 0, 0, 0;
0, 0, 0, 0, 0, 1, 0, 0;
0, 0, 0, 0, 0, 1, 0, 0, 0;
0, 0, 0, 0, 0, 1, 0, 0, 0, 0;
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0;
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0;
...
MATHEMATICA
Table[Array[Boole[And[PowerMod[n, Floor@ Log2@ n, #] != 0, GCD[n, #] > 1]] &, n], {n, 13}] // Flatten
(* Second program: extended data in rows from PNG image above: first, download the PNG and save it as "a304572.png", provides 2669205 terms: *)
MapIndexed[Take[#1, First@ #2] &, ImageData@ ColorNegate@ Import["a304572.png", "PNG"]] (* Michael De Vlieger, Jul 02 2018 *)
PROG
(PARI) T(n, k) = {my(r=vecprod(factor(k)[, 1])); n%r && gcd(n, k)<>1} \\ Andrew Howroyd, Nov 08 2018
CROSSREFS
KEYWORD
AUTHOR
Michael De Vlieger, May 23 2018
STATUS
approved