A125218 Numbers having at least two representations as 4*x*y-x-y with 1<=x<=y.

26, 41, 47, 56, 68, 71, 74, 86, 89, 96, 101, 107, 110, 116, 128, 131, 140, 146, 152, 155, 161, 166, 173, 176, 182, 185, 191, 194, 201, 206, 209, 215, 221, 224, 236, 239, 242, 250

Offset: 1

Author

Reinhard Zumkeller, Nov 24 2006

Keywords

• nonn

Comments

A125203(a(n)) > 1.

A124934 is the union of this sequence and A125217.

Links

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

Programs

Haskell

import Data.List (findIndices)
a125218 n = a125218_list !! (n-1)
a125218_list = map (+ 1) $ findIndices (> 1) a125203_list
-- Reinhard Zumkeller, Jan 02 2013