A156071 Concatenation chain arising in A156069.

3, 38, 381, 3816, 38165, 381654, 3816547, 38165472, 381654729

Offset

1,1

Comments

a(9) is a zeroless pandigital number in base 10, with 9 digits such that every k-digit substring ( 1 <= k <= 9 ) taken from the left, is divisible by k (see A163574). - Michel Marcus, Dec 01 2013

References

Matt Parker, Things to make and do in the fourth dimension, 2015, pages 7-9.

Links

Table of n, a(n) for n=1..9.

Blaine, How about a math puzzle?

Albert Franck, Puzzles, see item 7.

Wikipedia, Polydivisible number

Jim Wilson, Statement of Nine-Digit Number puzzle

Crossrefs

Cf. A010784, A030299, A050289, A143671, A144688, A156069, A158242, A163574.

Sequence in context: A002405 A050394 A281798 * A199025 A265914 A005780

Adjacent sequences: A156068 A156069 A156070 * A156072 A156073 A156074

Keyword

nonn,base,fini,full

Author

Alexander R. Povolotsky, Sep 25 2009

Status

approved