A118762 - OEIS

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A118762

First differences of A118757.

1, 1, 1, 1, 1, 1, 1, 1, 1, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,10

COMMENTS

a(10^k-1) = 10^k for 0<k<=3, but a(9999)=-1, a(9998)=10000;

abs(a(n)) = 10^k not for all n: e.g. a(1155) = A118757(1156) - A118757(1155) = 1123 - 1121 = 2.

LINKS

Table of n, a(n) for n=1..99.

CROSSREFS

Cf. A118768.

Sequence in context: A307978 A367614 A367616 * A360160 A360159 A284100

Adjacent sequences: A118759 A118760 A118761 * A118763 A118764 A118765

KEYWORD

sign

AUTHOR

Reinhard Zumkeller, May 01 2006

STATUS

approved