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A173822
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a(n) shows the digit sum of the smallest a(n+1) not yet present in the sequence
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3
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1, 10, 19, 9, 18, 8, 17, 7, 16, 6, 15, 5, 14, 4, 13, 3, 12, 2, 11, 29, 20, 101, 28, 26, 24, 22, 110, 37, 21, 100, 46, 31, 30, 102, 55, 23, 111, 38, 35, 32, 120, 39, 27, 25, 41, 40, 103, 64, 33, 201, 200, 299, 36, 42, 112, 47, 34, 121, 48, 44, 130, 49, 45, 50, 104, 73, 43, 202
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OFFSET
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1,2
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COMMENTS
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a(1) = 1, and for n > 1 a(n) is the smallest integer not yet present in the sequence with digital sum a substring of the decimal digits of a(n-1).
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LINKS
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EXAMPLE
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a(1) is 1, so a(2) must have digital sum 1, so a(2) = 10 (1 is already in the sequence). a(3) must then have digital sum 1, 0, or 10, so a(3) = 19. a(4) must have digital sum 1, 9, or 19 and so a(4) = 9.
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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