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A336478
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Lexicographically earliest sequence of distinct positive terms such that the sum of two consecutive terms has distinct digits in primorial base.
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1
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1, 3, 2, 8, 5, 9, 4, 6, 7, 12, 10, 13, 15, 11, 14, 38, 20, 32, 26, 53, 27, 25, 33, 19, 39, 40, 18, 34, 24, 28, 30, 22, 36, 16, 42, 37, 21, 31, 48, 47, 56, 23, 29, 50, 35, 17, 41, 44, 51, 49, 46, 54, 61, 43, 52, 63, 55, 45, 58, 57, 59, 60, 65, 68, 62, 71, 69
(list;
graph;
refs;
listen;
history;
text;
internal format)
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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 A321683.
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LINKS
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EXAMPLE
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The first terms, alongside the primorial representation of a(n)+a(n+1), are:
n a(n) prim(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 (4,2,0)
13 15 (4,1,0)
14 11 (4,0,1)
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PROG
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(PARI) 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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