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 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. 0
 9, 87, 654, 3210, 98765, 432109, 8765432, 10987654, 321098765, 4321098765, 43210987654, 321098765432, 1098765432109, 87654321098765, 432109876543210, 9876543210987654, 32109876543210987, 654321098765432109 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS This is similar to A062273 and A007923 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) LINKS Table of n, a(n) for n=1..18. EXAMPLE The first number in the sequence is 9. The second number in the sequence is 87. The third number in the sequence is 654. 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 *) CROSSREFS Cf. A007923, A062273. Sequence in context: A028339 A180751 A266828 * A055725 A219123 A144852 Adjacent sequences: A100811 A100812 A100813 * A100815 A100816 A100817 KEYWORD nonn,easy,base AUTHOR Parthasarathy Nambi, Jan 05 2005 EXTENSIONS More terms from Robert G. Wilson v and Lior Manor, Jan 14 2005 STATUS approved

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Last modified June 14 15:00 EDT 2024. Contains 373400 sequences. (Running on oeis4.)