OFFSET
0,4
COMMENTS
EXAMPLE
Row 7 of A225632 is:
1, 12, 84, 420;
Row 7 of A225642 is:
7, 84, 420;
the last two terms (84 and 420) are common to them, thus a(7)=2.
Row 14 of A225632 is:
1, 84, 1260, 16380, 180180, 360360;
Row 14 of A225642 is:
14, 630, 8190, 90090, 360360;
they have no common term until as the last term of those rows (which is A003418(14)=360360), thus a(14)=1.
PROG
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, May 24 2013
STATUS
approved