Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #12 May 11 2014 22:39:59
%S 0,0,1,2,4,0,3,5,4,1,10,0,6,2,13,10,16,1,18,6,14,8,22,4,23,6,17,8,28,
%T 15,30,11,19,18,24,2,36,21,28,12,40,12,42,20,24,21,46,12,47,24,36,2,
%U 40,21,49,37,22,26,58,14,60,31,51,44,50,8,66,36,44,23,70,8,72,37,55,40,62,20
%N a(n) = rightmost term of n-th row of triangle A112592. (For n >= 2, a(n) = number of terms in the (n-1)th row of triangle A112592 which are coprime to n.)
%H Diana Mecum, <a href="/A112635/b112635.txt">Table of n, a(n) for n = 1..517</a> [From _Diana L. Mecum_, Aug 12 2008]
%e The 6th row of triangle A112592 is [5,0,5,0,5,0]. So a(7) is the number of these terms which are coprime to 7. Now the three 5's are coprime to 7, but the 0's are not; so a(7) = 3.
%Y Cf. A112592, A112631.
%K nonn
%O 1,4
%A _Leroy Quet_, Dec 27 2005
%E Terms a(10) through a(517) from _Diana L. Mecum_, Aug 12 2008