A077750 Least significant digit of A077749(n).

0, 2, 6, 4, 0, 2, 6, 4, 0, 2, 6, 4, 0, 2, 6, 4, 0, 2, 6, 4, 0, 2, 6, 4, 0, 2, 6, 4, 0, 2, 6, 4, 0, 2, 6, 4, 0, 2, 6, 4, 0, 2, 6, 4, 0, 2, 6, 4, 0, 2, 6, 4, 0, 2, 6, 4, 0, 2, 6, 4, 0, 2, 6, 4, 0, 2, 6, 4, 0, 2, 6, 4, 0, 2, 6, 4, 0, 2, 6, 4, 0, 2, 6, 4, 0, 2, 6, 4, 0, 2, 6, 4, 0, 2, 6, 4, 0, 2, 6, 4, 0, 2, 6, 4, 0

Offset

0,2

Links

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

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

Formula

a(n) = A077749(n) - 10*floor(A077749(n)/10).

a(4n-3) = 0, a(4n-2) = 2, a(4n-1) = 6, a(4n) = 4, n > 0. - Sascha Kurz, Jan 04 2003

a(n) = 3-3*cos(n*Pi/2)-sin(n*Pi/2). - Wesley Ivan Hurt, May 07 2021

a(n) = A010879(A077749(n)). - Michel Marcus, Aug 22 2024

From Stefano Spezia, Aug 26 2024: (Start)

G.f.: 2*x*(1 + 2*x)/((1 - x)*(1 + x^2)).

E.g.f.: 3*exp(x) - 3*cos(x) - sin(x). (End)

Maple

seq((2^(n+1)-2) mod 10, n=0..160);

Crossrefs

Cf. A010879, A077749.

Sequence in context: A177761 A128192 A354375 * A332253 A379954 A247493

Adjacent sequences: A077747 A077748 A077749 * A077751 A077752 A077753

Keyword

base,nonn,easy

Author

Amarnath Murthy, Nov 20 2002

Extensions

More terms from Sascha Kurz, Jan 04 2003

Status

approved