A047547 - OEIS

A047547

Numbers that are congruent to {0, 2, 3, 4, 7} mod 8.

0, 2, 3, 4, 7, 8, 10, 11, 12, 15, 16, 18, 19, 20, 23, 24, 26, 27, 28, 31, 32, 34, 35, 36, 39, 40, 42, 43, 44, 47, 48, 50, 51, 52, 55, 56, 58, 59, 60, 63, 64, 66, 67, 68, 71, 72, 74, 75, 76, 79, 80, 82, 83, 84, 87, 88, 90, 91, 92, 95, 96, 98, 99, 100, 103

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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

From Chai Wah Wu, Jun 10 2016: (Start)

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

G.f.: x^2*(x^4 + 3*x^3 + x^2 + x + 2)/(x^6 - x^5 - x + 1). (End)

From Wesley Ivan Hurt, Jul 28 2016: (Start)

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

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

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

MAPLE

A047547:=n->8*floor(n/5)+[(0, 2, 3, 4, 7)][(n mod 5)+1]: seq(A047547(n), n=0..100); # Wesley Ivan Hurt, Jul 28 2016

MATHEMATICA

Select[Range[0, 100], MemberQ[{0, 2, 3, 4, 7}, Mod[#, 8]]&] (* Harvey P. Dale, Jun 14 2011 *)

PROG

(Magma) [n : n in [0..150] | n mod 8 in [0, 2, 3, 4, 7]]; // Wesley Ivan Hurt, Jul 28 2016

CROSSREFS

Sequence in context: A056033 A302123 A286337 * A014456 A349152 A089190

Adjacent sequences: A047544 A047545 A047546 * A047548 A047549 A047550

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved