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A282286 Least common multiple of 7*n+1 and 7*n-1. 3
1, 24, 195, 220, 783, 612, 1763, 1200, 3135, 1984, 4899, 2964, 7055, 4140, 9603, 5512, 12543, 7080, 15875, 8844, 19599, 10804, 23715, 12960, 28223, 15312, 33123, 17860, 38415, 20604, 44099, 23544, 50175, 26680, 56643, 30012, 63503, 33540, 70755, 37264, 78399 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Colin Barker, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (0,3,0,-3,0,1).

FORMULA

a(n) = 49*n^2-1 for n>0 and even.

a(n) = (49*n^2-1)/2 for n odd.

a(n) = 3*a(n-2) - 3*a(n-4) + a(n-6) for n>6.

G.f.: (1+24*x+192*x^2+148*x^3+201*x^4+24*x^5-2*x^6) / ((1-x)^3*(1+x)^3).

PROG

(PARI) vector(60, n, n--; lcm(7*n+1, 7*n-1))

(PARI) Vec((1+24*x+192*x^2+148*x^3+201*x^4+24*x^5-2*x^6) / ((1-x)^3*(1+x)^3) + O(x^60))

CROSSREFS

Cf. A000466, A136017, A141759, A282284, A282285.

Sequence in context: A271432 A042114 A220296 * A123197 A211151 A125361

Adjacent sequences:  A282283 A282284 A282285 * A282287 A282288 A282289

KEYWORD

nonn,easy

AUTHOR

Colin Barker, Feb 11 2017

STATUS

approved

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Last modified February 23 13:38 EST 2018. Contains 299581 sequences. (Running on oeis4.)