Numbers which are the cube roots of the product of their proper divisors: Difference between revisions

=={{header|J}}==

Note that the cube root of the proper divisors is the fourth root of all divisors of a positive integer. That said, we do not need to find roots here:

<syntaxhighlight lang=J>F=: ('';1 1 1;1 3;,7) e.~ __ <@/:~@{:@q:"0 ]</syntaxhighlilght>

Task examples:

<syntaxhighlight lang=J> N=: 1+I.F 1+i.2^18

5 10$N

1 24 30 40 42 54 56 66 70 78

88 102 104 105 110 114 128 130 135 136

138 152 154 165 170 174 182 184 186 189

190 195 222 230 231 232 238 246 248 250

255 258 266 273 282 285 286 290 296 297

499{N

2526

4999{N

23118

49999{N

223735</syntaxhighlight>