A031290 Position of n-th 3 in A007376.

3, 17, 37, 50, 52, 54, 56, 57, 58, 60, 62, 64, 66, 68, 77, 97, 117, 137, 157, 177, 201, 231, 261, 281, 284, 287, 290, 291, 293, 296, 299, 302, 305, 308, 321, 351, 381, 411, 441, 471, 501, 531, 561, 581, 584, 587, 590, 591, 593, 596

Offset: 1

Author

Clark Kimberling

Keywords

• nonn
• less
• base

Comments

A007376(a(n)) = 3.

Links

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

Crossrefs

Cf. A193428; A031287, A031288, A031289, A031291, A031292, A031293, A031294, A031295, A031296.

Programs

Haskell

import Data.List (elemIndices)
a031290 n = a031290_list !! (n-1)
a031290_list = map (+ 1) $ elemIndices 3 a007376_list
-- Reinhard Zumkeller, Jul 28 2011