%I A076542
%S A076542 1,2,86,89,90,133,5235,5236
%N A076542 Numbers n such that A068340(n)=+/-1.
%C A076542 Presumably A068340(n)=0 only for n=10; so I looked for n's such that 
               A068340(n)=+/-s; here s=1 (and n<=800000). For s=6, there's no solution 
               at all! For s=8, n=34 (only 1 solution); for s=7, n={55, 56} (2 solutions); 
               for s=9, n={5, 51, 52} (3 solutions) (for n up to 800000).
%Y A076542 Cf. A068340.
%Y A076542 Sequence in context: A078166 A101578 A041881 this_sequence A066226 A058439 
               A058463
%Y A076542 Adjacent sequences: A076539 A076540 A076541 this_sequence A076543 A076544 
               A076545
%K A076542 easy,nonn
%O A076542 1,2
%A A076542 Zak Seidov (zakseidov(AT)yahoo.com; zakseidov(AT)yahoo.com), Oct 19 2002