%I A158384
%S A158384 1,3,5,8,13,18,25,33,41,52,64,75,90,104,119,137,157,174,193,214,236,260,
%T A158384 289,312,340,369,396,426,458,487,523,560,596,631,671,708,751,794,835,
%U A158384 879,924,968,1019,1066,1116,1165,1218,1269,1322,1377,1430,1488,1551
%N A158384 Positions of Pell numbers in the sequence of Markoff numbers (A002559).
%C A158384 Only the odd-index Pell numbers (A001653) appear in the Markoff sequence. 
               The n-th term is about 0.5602*n^2.
%Y A158384 A158381
%Y A158384 Sequence in context: A097431 A123929 A036715 this_sequence A053651 A104563 
               A030762
%Y A158384 Adjacent sequences: A158381 A158382 A158383 this_sequence A158385 A158386 
               A158387
%K A158384 nonn
%O A158384 1,2
%A A158384 T. D. Noe (noe(AT)sspectra.com), Mar 19 2009