A100814 Digits 9 to 0 are written in order with increasing number of digits for each member of the sequence. Leading zeros are counted, but are not written down.

9, 87, 654, 3210, 98765, 432109, 8765432, 10987654, 321098765, 4321098765, 43210987654, 321098765432, 1098765432109, 87654321098765, 432109876543210, 9876543210987654, 32109876543210987, 654321098765432109

Offset: 1

Author

Parthasarathy Nambi, Jan 05 2005

Keywords

• nonn
• easy
• base

Comments

This is similar to A062273 and A007923

Examples

			The first number in the sequence is 9.
The second number in the sequence is 87.
The third number in the sequence is 654.
		

References

• C. Ashbacher, "Some problems concerning the Smarandache deconstructive sequence", Journal of Recreational Mathematics, vol. 29(2), 82-84 (1998)
• Russell Euler and Jawad Sadek, "Some divisibility patterns in the Smarandache deconstructive sequence", Journal of Recreational Mathematics, vol. 31(1), 12-14 (2002-2003)

Crossrefs

Cf. A007923, A062273.

Programs

Mathematica

With[{c=PadRight[{},250,Range[9,0,-1]]},Table[FromDigits[Take[c,{(n(n+1))/2+1,((n+1)(n+2))/2}]],{n,0,20}]] (* Harvey P. Dale, Jan 17 2017 *)

Extensions

More terms from Robert G. Wilson v and Lior Manor, Jan 14 2005