A047435 - OEIS

A047435

Numbers that are congruent to {1, 2, 4, 5, 6} mod 8.

1, 2, 4, 5, 6, 9, 10, 12, 13, 14, 17, 18, 20, 21, 22, 25, 26, 28, 29, 30, 33, 34, 36, 37, 38, 41, 42, 44, 45, 46, 49, 50, 52, 53, 54, 57, 58, 60, 61, 62, 65, 66, 68, 69, 70, 73, 74, 76, 77, 78, 81, 82, 84, 85, 86, 89, 90, 92, 93, 94, 97, 98, 100, 101, 102

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

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..65.

Index entries for linear recurrences with constant coefficients, signature (1,0,0,0,1,-1).

FORMULA

G.f.: x*(1+x)*(x^2-x+1)*(2*x^2+x+1) / ( (x^4+x^3+x^2+x+1)*(x-1)^2 ). - R. J. Mathar, Dec 07 2011

From Wesley Ivan Hurt, Aug 01 2016: (Start)

a(n) = a(n-1) + a(n-5) - a(n-6) for n > 6. a(n) = a(n-5) + 8 for n > 5.

a(n) = (40*n - 30 + 3*(n mod 5) + 3*((n+1) mod 5) - 2*((n+2) mod 5) + 3*((n+3) mod 5) - 7*((n+4) mod 5))/25.

a(5k) = 8k-2, a(5k-1) = 8k-3, a(5k-2) = 8k-4, a(5k-3) = 8k-6, a(5k-4) = 8k-7. (End)

MAPLE

A047435:=n->8*floor(n/5)+[(1, 2, 4, 5, 6)][(n mod 5)+1]: seq(A047435(n), n=0..100); # Wesley Ivan Hurt, Aug 01 2016

MATHEMATICA

Select[Range[0, 100], MemberQ[{1, 2, 4, 5, 6}, Mod[#, 8]] &] (* Wesley Ivan Hurt, Aug 01 2016 *)

PROG

(Magma) [n : n in [0..150] | n mod 8 in [1, 2, 4, 5, 6]]; // Wesley Ivan Hurt, Aug 01 2016

CROSSREFS

Sequence in context: A376423 A254820 A332570 * A331085 A132791 A352320

Adjacent sequences: A047432 A047433 A047434 * A047436 A047437 A047438

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved