A195670 Numbers that can be written using its own digits in order and by using addition and factorial operators.

144, 145, 733, 5160, 5161, 5162, 5163, 5164, 5165, 5166, 5167, 5168, 5169, 40440, 40441, 40442, 40443, 40444, 40445, 40446, 40447, 40448, 40449, 40584, 40585

Offset

1,1

Links

Table of n, a(n) for n=1..25.

Erich Friedman, Problem of the month August 2003

Example

144 = (1 + 4)! + 4!
145 = 1 + 4! + 5!
5160 = 5 + (1 + 6)! + 0
40440 = (4 + 0!)! + (4 + 4)! + 0
40584 = (4 + 0!)! + 5! + 8! + 4!
40585 = 4! + 0! + 5! + 8! + 5!

Crossrefs

Sequence in context: A124512 A199546 A101936 * A173065 A044868 A162532

Adjacent sequences: A195667 A195668 A195669 * A195671 A195672 A195673

Keyword

nonn,base

Author

Kausthub Gudipati, Sep 22 2011

Status

approved