A257646 Index of first row of triangle A103284 containing n.

0, 2, 3, 4, 4, 5, 5, 9, 5, 11, 6, 13, 6, 7, 16, 6, 18, 7, 20, 7, 22, 23, 24, 7, 26, 27, 9, 29, 7, 8, 32, 33, 34, 8, 10, 37, 38, 8, 40, 41, 42, 43, 44, 8, 46, 47, 48, 49, 9, 51, 52, 53, 8, 12, 56, 57, 58, 59, 9, 61, 62, 63, 64, 9, 13, 67, 68, 69, 70, 71, 72

Offset: 1

Author

Reinhard Zumkeller, Nov 19 2015

Keywords

• nonn

Comments

a(n) <= n + 1.

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A103284, A058084.

Programs

Haskell

import Data.List (findIndex); import Data.Maybe (fromJust)
a257646 n = fromJust $ findIndex (elem n) a103284_tabl