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A139389 Powers of ten in factorial base. 0
1, 120, 4020, 121220, 1651220, 23551220, 266251220, 2750051220, 25551151220, 210564451220 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

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).

LINKS

Table of n, a(n) for n=0..9.

Jonathan Wellons, More Information

EXAMPLE

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

CROSSREFS

Cf. A007623.

Sequence in context: A282612 A231136 A222003 * A166596 A000514 A179060

Adjacent sequences:  A139386 A139387 A139388 * A139390 A139391 A139392

KEYWORD

base,easy,nonn

AUTHOR

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

STATUS

approved

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Last modified June 5 18:48 EDT 2020. Contains 334854 sequences. (Running on oeis4.)