A264893 First differences of A155043.

1, 0, 1, 0, 1, -1, 2, -1, 0, 0, 1, -1, 2, -1, 1, 0, 1, -2, 3, -2, 2, -2, 3, -2, 0, 0, 3, -3, 4, -4, 5, -4, 4, -4, 5, -2, 3, -5, 5, -5, 6, -6, 7, -6, 5, -5, 6, -6, 1, 0, 6, -6, 7, -7, 7, -7, 8, -7, 8, -9, 10, -8, 7, 0, 2, -9, 10, -9, 9, -9, 10, -12, 13, -10

Offset

0,7

Comments

a(n) = A155043(n+1) - A155043(n);

a(A264898(n)) = 0;

it is not true that in general a(even) >= 0 and a(odd) <= 0:

even indices with negative values: 224,226,1088,1090,1368,1520,1860, ...

odd indices with positive values: 225,441,445,675,1023,1035,1089,1093, ... .

Links

Reinhard Zumkeller, Table of n, a(n) for n = 0..10000

Prog

(Haskell)
a264893 n = a264893_list !! n
a264893_list = zipWith (-) (tail a155043_list) a155043_list

Crossrefs

Cf. A155043, A264898.

Sequence in context: A269518 A219840 A343220 * A340653 A334744 A136567

Adjacent sequences: A264890 A264891 A264892 * A264894 A264895 A264896

Keyword

sign,look

Author

Reinhard Zumkeller, Nov 27 2015

Status

approved