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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 * A372622 A344622 A068059
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Oct 17 2010
STATUS
approved

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Last modified July 12 13:47 EDT 2024. Contains 374247 sequences. (Running on oeis4.)