0,2

Next term has a "ten" digit.

Also called factoradix.

With hexadecimal extended to use the whole alphabet, the sequence continues: 17a5726651220, 12092315551220, b6781182251220, 799b90920051220, 4c71069221151220, 2dcaa584234451220, 1a1f264b9386651220, fb2797aa5975551220, 8437c58494852251220, 423g9bad8a4580051220, 1k213c54aa81881151220

10^48 needs a "36" digit. We can say with high probability that 10^64 is the last value that can be written without needing any digits larger than 35 (checked up to 10^1400, where it is vanishingly unlikely).

Jonathan Wellons, More Information

10000 = 1 * 7! + 6 * 6! + 5 * 5! + 1 * 4! + 2 * 3! + 2 * 2! + 0 * 1!. Hence 10000 is 1651220 in factoradix.

Cf. A007623.

Sequence in context: A052721 A060490 A052722 this_sequence A000514 A055360 A001807

Adjacent sequences: A139386 A139387 A139388 this_sequence A139390 A139391 A139392

base,easy,nonn

Jonathan Wellons (wellons(AT)gmail.com), Jun 08 2008