A067761 - OEIS

A067761

Positive integers divisible by 5 but not by 7.

5, 10, 15, 20, 25, 30, 40, 45, 50, 55, 60, 65, 75, 80, 85, 90, 95, 100, 110, 115, 120, 125, 130, 135, 145, 150, 155, 160, 165, 170, 180, 185, 190, 195, 200, 205, 215, 220, 225, 230, 235, 240, 250, 255, 260, 265, 270, 275, 285, 290, 295, 300, 305, 310, 320

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OFFSET

1,1

REFERENCES

Kenneth H. Rosen, Discrete Mathematics and Its Applications, 4th Ed., p. 79, 1.7.32.b.

LINKS

Table of n, a(n) for n=1..55.

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

FORMULA

a(n) = 5*A047304(n). - Zak Seidov, Mar 19 2014

a(n) = a(n - 6) + 35. - David A. Corneth, Jun 17 2020

G.f.: 5*x*(x^6+x^5+x^4+x^3+x^2+x+1)/(x^7-x^6-x+1). - Alois P. Heinz, Jun 17 2020