%I
%S 3,5,7,10,12,17,19,21,24,26,28,31,33,37,39,42,44,47,49,52,55,57,59,64,
%T 66,69,71,73,75,78,81,83,85,90,92,95,97,100,102,104,107,109,111,113,
%U 115,117,120,123,129,131,133,136,138,140,143,145,149,152,155,157,159,162,164,169,171,173,176,178
%N Numbers k such that A098550(k) is a multiple of 3.
%C This sequence is now known to be infinite.
%H Chai Wah Wu, <a href="/A251553/b251553.txt">Table of n, a(n) for n = 1..10000</a>
%o (Haskell)
%o a251553 n = a251553_list !! (n1)
%o a251553_list = filter ((== 0) . flip mod 3 . a098550) [1..]
%o  _Reinhard Zumkeller_, Dec 19 2014
%Y Cf. A098550.
%Y Second row of array A251716.
%K nonn
%O 1,1
%A _N. J. A. Sloane_, Dec 18 2014
