OFFSET
1,4
COMMENTS
Conjecture: Every value appears twice on every line of rational slope that contains an infinite number of points.
LINKS
Peter Kagey, Table of n, a(n) for n = 1..5000
Peter Kagey, Haskell program for enumerating sequence.
EXAMPLE
Table begins:
A B C D E F
+---+---+---+---+---+---+
1 | 1 | 1 | 2 | 3 | 4 | 3 |
+---+---+---+---+---+---+
2 | 1 | 1 | 3 | 2 | 2 | |
+---+---+---+---+---+---+
3 | 2 | 2 | 3 | 1 | | |
+---+---+---+---+---+---+
4 | 2 | 2 | 1 | | | |
+---+---+---+---+---+---+
5 | 3 | 4 | | | | |
+---+---+---+---+---+---+
6 | 3 | | | | | |
+---+---+---+---+---+---+
a(17) = 4 (B5) because:
1 already appears twice on the line connecting B1-B2,
2 already appears twice on the line connecting B3-B4, and
3 already appears twice on the line connecting D1-C3.
CROSSREFS
AUTHOR
Peter Kagey, Mar 27 2017
STATUS
approved