This is very interesting.

I put in 5 digits per position and actually got less than 80 numbers; just 61. And this is because some of the digits repeated (456).

Fist: 12345

Second: 56789

Third: 45678

Playlist 12345-56789-45678:
145 156 157 158 146 167 168 147 178 148 149 159 169 179 189 245 256 257 258 246 267 268 247 278 248 249 259 269 279 289 345 356 357 358 346 367 368 347 378 348 349 359 369 379 389 456 457 458 467 468 478 459 469 479 489 567 568 578 569 579 589 (61)

Food for Thought