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A328755
Lexicographically earliest sequence of distinct positive numbers such that for any n > 0, the first nonzero digit of a(n+1)/a(n) is "4".
2
1, 4, 16, 7, 3, 12, 5, 2, 8, 32, 13, 6, 24, 10, 40, 17, 68, 28, 112, 45, 18, 72, 29, 14, 56, 23, 11, 44, 19, 9, 36, 15, 60, 25, 100, 41, 20, 80, 33, 132, 53, 22, 88, 37, 148, 61, 26, 104, 42, 168, 69, 30, 120, 48, 21, 84, 34, 136, 55, 27, 108, 46, 184, 74, 31
OFFSET
1,2
COMMENTS
In other words, for any n > 0, we have an integer k such that floor(10^k * a(n+1)/a(n)) = 4.
This sequence has interesting graphical features (unique from the other 8 variants of this sequence).
LINKS
EXAMPLE
The first terms, alongside a(n+1)/a(n), are:
n a(n) a(n+1)/a(n)
-- ---- -----------
1 1 4
2 4 4
3 16 0.4375
4 7 0.428571...
5 3 4
6 12 0.416666...
7 5 0.4
8 2 4
9 8 4
10 32 0.40625
11 13 0.461538...
12 6 4
CROSSREFS
See A328752 for similar sequences.
Sequence in context: A059156 A050080 A329068 * A187532 A335353 A110651
KEYWORD
nonn,look,base
AUTHOR
Rémy Sigrist, Oct 27 2019
STATUS
approved