A031289 Position of n-th 2 in A007376.

2, 15, 30, 32, 34, 35, 36, 38, 40, 42, 44, 46, 48, 55, 75, 95, 115, 135, 155, 175, 198, 228, 251, 254, 257, 258, 260, 263, 266, 269, 272, 275, 278, 288, 318, 348, 378, 408, 438, 468, 490, 493, 496, 498, 499, 502, 505, 508, 511, 514

Offset: 1

Author

Clark Kimberling

Keywords

• nonn
• less
• base

Comments

A007376(a(n)) = 2.

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A193428; A031287, A031288, A031290, A031291, A031292, A031293, A031294, A031295, A031296.

Programs

Haskell

import Data.List (elemIndices)
a031289 n = a031289_list !! (n-1)
a031289_list = map (+ 1) $ elemIndices 2 a007376_list
-- Reinhard Zumkeller, Jul 28 2011