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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 13, 14, 15, 18, 19, 20, 21, 24, 25, 26, 27, 30, 31, 32, 33, 36, 37, 38, 39, 60, 61, 62, 63, 66, 67, 68, 69, 90, 91, 92, 93, 96, 97, 98, 99, 120, 121, 122, 123, 126, 127, 128, 129, 150, 151, 152, 153, 156, 157, 158, 159, 180
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listen;
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internal format)
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OFFSET
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1,3
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COMMENTS
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Equivalently, these are the numbers with all digits, except possibly the leading digit, equal to zero or one in primorial base.
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LINKS
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EXAMPLE
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The first terms, alongside their primorial base representation, are:
n a(n) pbr(a(n))
-- ---- ---------
1 0 (0)
2 1 (1)
3 2 (1, 0)
4 3 (1, 1)
5 4 (2, 0)
6 5 (2, 1)
7 6 (1, 0, 0)
8 7 (1, 0, 1)
9 8 (1, 1, 0)
10 9 (1, 1, 1)
11 12 (2, 0, 0)
12 13 (2, 0, 1)
13 14 (2, 1, 0)
14 15 (2, 1, 1)
15 18 (3, 0, 0)
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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