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
Rémy Sigrist, Table of n, a(n) for n = 1..10000
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
KEYWORD
AUTHOR
Rémy Sigrist, Oct 27 2019
STATUS
approved