A171888 Records in A171868 (values).

1, 2, 5, 6, 9, 10, 11, 13, 15, 16, 18, 19, 21, 22, 23, 24, 27, 28, 29, 30, 31, 33, 34

Offset

1,2

Links

Table of n, a(n) for n=1..23.

Rémy Sigrist, C program for A171888

Prog

(Python)
A181391_list, A171888_list, l, r = [0, 0], [1], 0, 1
for n in range(1, 10**6):
....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)
........if n-l > r:
............r = n-l
............A171888_list.append(r)
........l = n # Chai Wah Wu, Jan 02 2015
(C) See Links section.

Crossrefs

Cf. A181391, A171865, A171868, A171887.

Sequence in context: A284507 A284492 A224779 * A286905 A028946 A213713

Adjacent sequences: A171885 A171886 A171887 * A171889 A171890 A171891

Keyword

nonn,more

Author

N. J. A. Sloane, Oct 18 2010

Extensions

a(12)-a(13) from Chai Wah Wu, Jan 02 2015

a(14)-a(17) from Rémy Sigrist, Jun 11 2019

a(18)-a(23) from Benjamin Chaffin, Sep 11 2019

Status

approved