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A330384
Single-digit numbers in order of appearance in decimal expansions of composite numbers, followed by two-digit numbers in order of appearance, then three-digit numbers and so forth.
1
4, 6, 8, 9, 1, 0, 2, 5, 7, 3, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86
OFFSET
1,1
LINKS
Rémy Sigrist, Colored scatterplot of the first 110000 terms (red pixels indicate terms that are prime)
EXAMPLE
From Rémy Sigrist, Dec 24 2019: (Begin)
The first terms, alongside the corresponding composite numbers, are:
n a(n) Composite
-- ---- ---------
1 4 4
2 6 6
3 8 8
4 9 9
5 1 10
6 0 10
7 2 12
8 5 15
9 7 27
10 3 30
11 10 10
12 12 12
13 14 14
...
79 99 99
80 11 110
81 17 117
82 19 119
83 23 123
(End)
PROG
(PARI) See Links section.
CROSSREFS
KEYWORD
nonn,base,look
AUTHOR
David Williams, Dec 12 2019
EXTENSIONS
More terms from Rémy Sigrist, Dec 24 2019
STATUS
approved