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

Author

Reinhard Zumkeller, Dec 24 2012

Keywords

• nonn

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

Crossrefs

Cf. A137905, A098565, A182237, A059233.

Programs

Haskell

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

Formula

A059233(a(n)) = 1.

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