A030338 Length of n-th run of digit 2 in A003137.

1, 2, 1, 2, 1, 1, 1, 1, 3, 1, 1, 2, 1, 1, 3, 2, 3, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 4, 1, 1, 2, 1, 1, 2, 1, 1, 1, 1, 3, 1, 1, 2, 1, 1, 2, 1, 1, 1, 1, 4, 2, 2, 3, 2, 2, 4, 3, 4, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 3, 1

Offset

1,2

Links

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

Prog

(Haskell)
import Data.List (group)
a030338 n = a030338_list !! (n-1)
a030338_list = map length $ filter ((== 2) . head) $ group a003137_list
-- Reinhard Zumkeller, Feb 21 2013

Crossrefs

Cf. A003137.

Cf. A030336, A030337, A030334.

Sequence in context: A161895 A048138 A165022 * A231148 A266649 A159847

Adjacent sequences: A030335 A030336 A030337 * A030339 A030340 A030341

Keyword

nonn,base

Author

Clark Kimberling

Status

approved