OFFSET
1,2
COMMENTS
58 is the last value in the Optimal Ruler Conjecture of Peter Luschny. The conjecture is known to be true to length 213.
LINKS
EXAMPLE
The sparse rulers of length 23 and 58 are as follows:
III........I...I..I..I.I
II..I.....I.....I.I..I.I
IIII.......................I....I...I...I...I...I...I..I..I
III...I.I........I........I........I........I..I......I..II
III.....I......II.........I.........I.........I..I...I.I..I
II.I..I..........I..I......I.......I.........I...I...I...II
II.I..I..........I......I..I..........I......I...I...I...II
II...I..I...I........I........I........I........I....II.I.I
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Ed Pegg Jr, Dec 07 2021
STATUS
approved