A031294 Position of n-th 7 in A007376.

7, 25, 45, 65, 85, 105, 125, 130, 132, 134, 136, 138, 140, 142, 144, 145, 146, 148, 165, 185, 213, 243, 273, 303, 333, 363, 393, 401, 404, 407, 410, 413, 416, 419, 422, 423, 425, 428, 453, 483, 513, 543, 573, 603, 633, 663, 693

Offset: 1

Author

Clark Kimberling

Keywords

• nonn
• less
• base

Comments

A007376(a(n)) = 7.

Links

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

Crossrefs

Cf. A193428; A031287, A031288, A031289, A031290, A031291, A031292, A031293, A031295, A031296.

Programs

Haskell

import Data.List (elemIndices)
a031294 n = a031294_list !! (n-1)
a031294_list = map (+ 1) $ elemIndices 7 a007376_list
-- Reinhard Zumkeller, Jul 28 2011