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A322845
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Lexicographically earliest sequence of distinct positive terms such that the sum of two consecutive terms has distinct digits in factorial base.
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3
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1, 3, 2, 8, 5, 9, 4, 6, 7, 12, 10, 13, 33, 34, 43, 24, 22, 45, 23, 44, 38, 29, 17, 50, 18, 28, 39, 46, 21, 25, 42, 26, 20, 47, 30, 16, 51, 31, 15, 52, 49, 19, 27, 40, 37, 48, 53, 14, 32, 35, 11, 56, 54, 55, 60, 41, 36, 65, 173, 182, 174, 64, 291, 170, 68, 287
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OFFSET
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1,2
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COMMENTS
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In other words, for any n > 0, a(n) + a(n+1) belongs to A321682.
Apparently, all the positive integers appear in the sequence.
This sequence has interesting graphical features (see scatterplots in Links section).
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LINKS
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EXAMPLE
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The first terms, alongside the factorial representation of a(n)+a(n+1), are:
n a(n) fact(a(n)+a(n+1))
-- ---- -----------------
1 1 (2,0)
2 3 (2,1)
3 2 (1,2,0)
4 8 (2,0,1)
5 5 (2,1,0)
6 9 (2,0,1)
7 4 (1,2,0)
8 6 (2,0,1)
9 7 (3,0,1)
10 12 (3,2,0)
11 10 (3,2,1)
12 13 (1,3,2,0)
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PROG
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(C) // See Links section.
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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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