A185024 Numbers occurring in just one row of Pascal's triangle.

2, 3, 4, 5, 7, 8, 9, 11, 12, 13, 14, 16, 17, 18, 19, 22, 23, 24, 25, 26, 27, 29, 30, 31, 32, 33, 34, 37, 38, 39, 40, 41, 42, 43, 44, 46, 47, 48, 49, 50, 51, 52, 53, 54, 57, 58, 59, 60, 61, 62, 63, 64, 65, 67, 68, 69, 71, 72, 73, 74, 75, 76, 77, 79, 80, 81

Offset

1,1

Links

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

Formula

A059233(a(n)) = 1.

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

Prog

(Haskell)
import Data.List (elemIndices)
a185024 n = a185024_list !! (n-1)
a185024_list = map (+ 2 ) $ elemIndices 1 a059233_list

Crossrefs

Cf. A137905, A098565, A182237, A059233.

Sequence in context: A039203 A050746 A039117 * A359913 A247915 A284676

Adjacent sequences: A185021 A185022 A185023 * A185025 A185026 A185027

Keyword

nonn

Author

Reinhard Zumkeller, Dec 24 2012

Status

approved