OFFSET
1,1
COMMENTS
EXAMPLE
The irregular triangle T(n, k) begins (here N = A033949(n)):
n, N \ k 1 2 3 4 5 6 7 8 9 10 ...
1, 8: 2 2 2
2, 12: 2 2 2
3, 15: 4 4 2 4
4, 16: 4 4 2 4 4
5, 20: 4 4 2 4 4 2
6, 21: 6 6 6 2 6 6
7, 24: 2 2 2 2 2 2 2
8, 28: 6 6 6 2 6 6 6
9, 30: 4 2 4 4 2 4 2
10, 32: 8 8 4 8 8 2 8 4 8 2
11, 33: 10 10 10 10 10 10 2 10 5
12, 35: 12 12 3 4 12 6 12 2 6
13, 36: 6 6 6 3 2 2 6 6 6
14, 39: 12 4 12 12 6 12 6 6 4 12
15, 40: 4 4 2 4 4 2 4 2 2 4
...
The sequence of phi(N) begins: 4, 4, 8, 8, 8, 12, 8, 12, 8, 16, 20, 24, 12, 24, 16, ...
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Wolfdieter Lang, Jan 30 2017
STATUS
approved