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A097045 a(n) = a(n-1) - a(floor(sqrt(n))) for n > 1; a(1) = 1. 1
1, 0, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 71, 71, 71, 71, 71, 71, 71, 71 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

LINKS

Table of n, a(n) for n=1..88.

FORMULA

a(1)=1; a(n) = a(n-1) - a(floor(sqrt(n))) for n > 1.

CROSSREFS

Cf. A097046 ( a(n-1) + a(floor(sqrt(n))) ).

Sequence in context: A289207 A061019 A028310 * A118760 A130446 A132086

Adjacent sequences:  A097042 A097043 A097044 * A097046 A097047 A097048

KEYWORD

sign

AUTHOR

Rick L. Shepherd, Jul 20 2004

STATUS

approved

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Last modified August 25 21:00 EDT 2019. Contains 326324 sequences. (Running on oeis4.)