A171868 First differences of A171865.

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

Offset

1,2

Links

N. J. A. Sloane, Table of n, a(n) for n = 1..15098

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

Cf. A181391, A171865, A171888, A171887.

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

Adjacent sequences: A171865 A171866 A171867 * A171869 A171870 A171871

Keyword

nonn

Author

N. J. A. Sloane, Oct 18 2010

Status

approved