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

3, 5, 7, 10, 12, 17, 19, 21, 24, 26, 28, 31, 33, 37, 39, 42, 44, 47, 49, 52, 55, 57, 59, 64, 66, 69, 71, 73, 75, 78, 81, 83, 85, 90, 92, 95, 97, 100, 102, 104, 107, 109, 111, 113, 115, 117, 120, 123, 129, 131, 133, 136, 138, 140, 143, 145, 149, 152, 155, 157, 159, 162, 164, 169, 171, 173, 176, 178

Offset: 1

Author

N. J. A. Sloane, Dec 18 2014

Keywords

• nonn

Comments

This sequence is now known to be infinite.

Links

• Chai Wah Wu, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A098550.

Second row of array A251716.

Programs

Haskell

a251553 n = a251553_list !! (n-1)
a251553_list = filter ((== 0) . flip mod 3 . a098550) [1..]
-- Reinhard Zumkeller, Dec 19 2014