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A251553 Numbers k such that A098550(k) is a multiple of 3. 3

%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 !! (n-1)

%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

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Last modified May 22 22:13 EDT 2022. Contains 353959 sequences. (Running on oeis4.)