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A161995
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a(n) represents the minimum number k, not already present in the sequence, whose digits sum is equal to the digital root of Sum{j=0..n-1}{a(j)}, with a(0)=0 and a(1)=1.
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0, 1, 10, 2, 4, 8, 7, 5, 100, 11, 13, 17, 16, 14, 1000, 20, 22, 26, 25, 23, 10000, 101, 31, 35, 34, 32, 100000, 110, 40, 44, 43, 41, 1000000, 200, 103, 53, 52, 50, 10000000, 1001, 112, 62, 61, 104, 100000000, 1010, 121, 71, 70, 113, 1000000000, 1100, 130, 80, 106
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| From a(3) onward the digital root is periodic with period length equal to six: 1,2,4,8,7,5.
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EXAMPLE
| a(3)=10 because a(0)+a(1)=1 and 10 is the minimum number greater than 1 whose digit sum is equal to 1.
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CROSSREFS
| A010888
Sequence in context: A160136 A049296 A169851 * A069036 A155817 A037922
Adjacent sequences: A161992 A161993 A161994 * A161996 A161997 A161998
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KEYWORD
| easy,nonn,base
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AUTHOR
| Paolo P. Lava & Giorgio Balzarotti (paoloplava(AT)gmail.com), Jun 24 2009
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