1,1

Reinhard Zumkeller, Table of n, a(n) for n = 1..2500

Wikipedia, Singmaster's conjecture

Index entries for triangles and arrays related to Pascal's triangle

A059233(a(n)) = 1.

a(n) = A137905(n-1), n >= 2. - Elijah Beregovsky, May 14 2019

(Haskell)

import Data.List (elemIndices)

a185024 n = a185024_list !! (n-1)

a185024_list = map (+ 2 ) $ elemIndices 1 a059233_list

Cf. A137905, A098565, A182237, A059233.

Sequence in context: A039203 A050746 A039117 * A247915 A284676 A187681

Adjacent sequences: A185021 A185022 A185023 * A185025 A185026 A185027

nonn

Reinhard Zumkeller, Dec 24 2012

approved