OFFSET
1,2
COMMENTS
This sequence is a variant of A305410; here we consider geometric progressions, there arithmetic progressions.
LINKS
Rémy Sigrist, Table of n, a(n) for n = 1..6667
Rémy Sigrist, PARI program for A334390
EXAMPLE
The first terms, alongside the corresponding common ratios, are:
n a(n) a(2*n) a(2*n+1) r
-- ---- ------ -------- ---
1 1 2 4 2
2 2 6 18 3
3 4 8 16 2
4 6 12 24 2
5 18 30 50 5/3
6 8 28 98 7/2
7 16 20 25 5/4
8 12 36 108 3
9 24 48 96 2
10 30 60 120 2
PROG
(PARI) See Links section.
CROSSREFS
KEYWORD
nonn
AUTHOR
Rémy Sigrist, Apr 26 2020
STATUS
approved