1,3
David W. Wilson, Table of n, a(n) for n = 1..10000
Summary of increasing sequences avoiding arithmetic progressions of specified lengths (the second of each pair is obtained by adding 1 to the first):
3-term AP: A005836 (>=0), A003278 (>0);
4-term AP: A005839 (>=0), A005837 (>0);
5-term AP: A020654 (>=0), A020655 (>0);
6-term AP: A020656 (>=0), A005838 (>0);
7-term AP: A020657 (>=0), A020658 (>0);
8-term AP: A020659 (>=0), A020660 (>0);
9-term AP: A020661 (>=0), A020662 (>0);
10-term AP: A020663 (>=0), A020664 (>0).
Sequence in context: A277050 A013937 A118065 * A284837 A068937 A285316
Adjacent sequences: A020658 A020659 A020660 * A020662 A020663 A020664
nonn
David W. Wilson
approved