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

Author

N. J. A. Sloane, Oct 18 2010

Keywords

• nonn

Links

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

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

Programs

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