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A070482 a(n) = n^3 mod 20. 2
0, 1, 8, 7, 4, 5, 16, 3, 12, 9, 0, 11, 8, 17, 4, 15, 16, 13, 12, 19, 0, 1, 8, 7, 4, 5, 16, 3, 12, 9, 0, 11, 8, 17, 4, 15, 16, 13, 12, 19, 0, 1, 8, 7, 4, 5, 16, 3, 12, 9, 0, 11, 8, 17, 4, 15, 16, 13, 12, 19, 0, 1, 8, 7, 4, 5, 16, 3, 12, 9, 0, 11, 8, 17, 4, 15, 16, 13, 12, 19, 0, 1, 8, 7, 4, 5 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..1000

FORMULA

From G. C. Greubel, Mar 28 2016: (Start)

a(n) = a(n-20).

G.f.: (-x -8*x^2 -7*x^3 -4*x^4 -5*x^5 -16*x^6 -3*x^7 -12*x^8 -9*x^9 -11*x^11 -8*x^12 -17*x^13 -4*x^14 -15*x^15 -16*x^16 -13*x^17 -12*x^18 -19*x^19)/(-1 + x^20). (End)

MATHEMATICA

PowerMod[Range[0, 90], 3, 20] (* G. C. Greubel, Mar 28 2016 *)

PROG

(Sage) [power_mod(n, 3, 20 )for n in range(0, 86)] # Zerinvary Lajos, Oct 29 2009

(PARI) a(n)=n^3%20 \\ Charles R Greathouse IV, Apr 06 2016

CROSSREFS

Sequence in context: A077744 A111448 A169885 * A070702 A019870 A019903

Adjacent sequences:  A070479 A070480 A070481 * A070483 A070484 A070485

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, May 12 2002

STATUS

approved

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Last modified October 24 13:43 EDT 2021. Contains 348232 sequences. (Running on oeis4.)