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A171868 First differences of A171865. 4
1, 2, 2, 5, 2, 5, 3, 4, 6, 5, 6, 3, 3, 5, 4, 3, 4, 3, 6, 9, 3, 5, 3, 6, 3, 4, 5, 6, 5, 4, 4, 5, 4, 4, 6, 4, 4, 6, 6, 5, 6, 4, 4, 9, 3, 3, 6, 4, 3, 10, 3, 4, 4, 6, 4, 5, 3, 3, 6, 6, 7, 3, 5, 4, 5, 4, 6, 6, 6, 5, 4, 6, 4, 4, 6, 4, 5, 4, 7, 3, 4, 5, 4, 8, 10, 3, 5, 5, 6, 3, 8, 4, 4, 6, 7, 6, 6, 10, 4, 4, 8, 3, 4, 4 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
PROG
(Haskell)
a171868 n = a171868_list !! (n-1)
a171868_list = zipWith (-) (tail a171865_list) a171865_list
-- Reinhard Zumkeller, Oct 31 2011
(Python)
A181391_list, A171868_list, l = [0, 0], [1], 0
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)
........A171868_list.append(n-l)
........l = n # Chai Wah Wu, Jan 02 2015
CROSSREFS
Identical to A171889 except for the leading 0. - Jan Ritsema van Eck (j.ritsemavaneck(AT)planet.nl), Oct 19 2010
Sequence in context: A007610 A068066 A171889 * A292146 A334685 A340694
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Oct 18 2010
STATUS
approved

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Last modified June 13 17:32 EDT 2024. Contains 373391 sequences. (Running on oeis4.)