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A171865 Positions of 0's in A181391. 12
1, 2, 4, 6, 11, 13, 18, 21, 25, 31, 36, 42, 45, 48, 53, 57, 60, 64, 67, 73, 82, 85, 90, 93, 99, 102, 106, 111, 117, 122, 126, 130, 135, 139, 143, 149, 153, 157, 163, 169, 174, 180, 184, 188, 197, 200, 203, 209, 213, 216, 226, 229, 233, 237, 243, 247, 252, 255, 258, 264, 270 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
A181391(a(n)) = 0; the sequence is infinite, proof by Jan Ritsema van Eck in comments in A181391.
LINKS
PROG
(Haskell)
import Data.List (elemIndices)
a171865 n = a171865_list !! (n-1)
a171865_list = map (+ 1) $ elemIndices 0 a181391_list
-- Reinhard Zumkeller, Oct 31 2011
(Python)
A181391_list, A171865_list = [0, 0], [1, 2]
for n in range(1, 10**4):
....for m in range(n-1, -1, -1):
........if A181391_list[m] == A181391_list[n]:
............A181391_list.append(n-m)
............break
....else:
........A181391_list.append(0)
........A171865_list.append(n+2) # Chai Wah Wu, Jan 02 2015
CROSSREFS
Sequence in context: A327309 A350668 A078198 * A344622 A068059 A108868
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Oct 17 2010
STATUS
approved

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Last modified March 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)