A105332 - OEIS

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A105332

a(n) = n*(n+1)/2 mod 8.

3

0, 1, 3, 6, 2, 7, 5, 4, 4, 5, 7, 2, 6, 3, 1, 0, 0, 1, 3, 6, 2, 7, 5, 4, 4, 5, 7, 2, 6, 3, 1, 0, 0, 1, 3, 6, 2, 7, 5, 4, 4, 5, 7, 2, 6, 3, 1, 0, 0, 1, 3, 6, 2, 7, 5, 4, 4, 5, 7, 2, 6, 3, 1, 0, 0, 1, 3, 6, 2, 7, 5, 4, 4, 5, 7, 2, 6, 3, 1, 0, 0, 1, 3, 6, 2, 7, 5, 4, 4, 5, 7, 2, 6, 3, 1, 0, 0, 1, 3, 6, 2, 7, 5, 4, 4

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OFFSET

0,3

COMMENTS

Periodic with period length 16. - Ray Chandler, Apr 18 2025

LINKS

Table of n, a(n) for n=0..104.

Index entries for linear recurrences with constant coefficients, signature (1,-1,1,-1,1,-1,1,-1,1,-1,1,-1,1,-1,1).

MATHEMATICA

Mod[Accumulate[Range[0, 110]], 8] (* Harvey P. Dale, Nov 03 2013 *)

PROG

(Python)

def A105332(n): return (n*(n+1)>>1)&7 # Chai Wah Wu, Apr 17 2025

CROSSREFS

See A105198 for further information.

Sequence in context: A376559 A306640 A169751 * A274632 A186706 A169749

Adjacent sequences: A105329 A105330 A105331 * A105333 A105334 A105335

KEYWORD

nonn,easy

AUTHOR

Oscar Takeshita, May 01 2005

STATUS

approved