OFFSET
1,3
COMMENTS
FORMULA
EXAMPLE
Triangle begins:
1: [1]
2: [1, 2]
3: [1, 3]
4: [2, 4]
5: [1, 5]
6: [1, 2, 3, 6]
7: [1, 7]
8: [4, 8]
9: [3, 9]
10: [1, 2, 5, 10]
11: [1, 11]
12: [2, 4, 6, 12]
13: [1, 13]
14: [1, 2, 7, 14]
15: [1, 3, 5, 15]
16: [8, 16]
17: [1, 17]
18: [3, 6, 9, 18]
19: [1, 19]
20: [2, 4, 10, 20]
PROG
(PARI) for (n=1, 28, fordiv (n, d, if (issquarefree(n/d), print1 (d ", "))))
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Rémy Sigrist, Nov 29 2017
STATUS
approved