OFFSET
1,2
COMMENTS
This sequence is a permutation of the natural numbers.
LINKS
Rémy Sigrist, Table of n, a(n) for n = 1..10000
Rémy Sigrist, C++ program for A285386
Rémy Sigrist, Scatterplot of the first 100000 terms
EXAMPLE
The first terms, alongside the primes p such that p^4 divides a(n)*a(n+1), are:
n a(n) p
-- ---- -
1 1 2
2 16 2
3 2 2
4 8 2
5 4 2
6 12 2
7 20 2
8 24 2
9 6 3
10 27 3
11 3 2
12 32 2
13 5 2
14 48 2
15 7 2
16 64 2
17 9 3
18 18 3
19 36 2
20 28 2
...
165 95 2
166 432 2, 3
167 87 3
...
CROSSREFS
KEYWORD
nonn
AUTHOR
Rémy Sigrist, Apr 18 2017
STATUS
approved