A097382 - OEIS

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A097382

a(h) = d(h,j) = lcm( f(h,j,1) ... f(h,j,h) ), when j=2.

1, 4, 35, 20, 3003, 560, 692835, 4620, 185910725, 48048, 136745788725, 1361360, 4281195077775, 22170720, 6541380665835015, 446185740, 1898924328582105825, 5949143200, 90048990529077755175

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

OFFSET

1,2

COMMENTS

See A091342, A025558

LINKS

Table of n, a(n) for n=1..19.

FORMULA

Given (1) f(h, j, a) = ( [ ((a/gcd(a, h)) / gcd(j+1, (a/gcd(a, h)))) * (h(j+1)) ] - [ ((a/gcd(a, h)) / gcd(j+1, (a/gcd(a, h)))) * (ja) ]) / a then let (2) a(h) = d(h, j) = lcm( f(h, j, 1) ... f(h, j, h) )

EXAMPLE

a(2) = 4 = lcm(4,1)

a(5) = 3003 = lcm(13,11,3,7,1)

a(6) = 560 = lcm(16,7,4,5,8,1)

a(13) = 4281195077775 = lcm(37,35,11,31,29,9,25,23,7,19,17,5,1)

CROSSREFS

Sequence in context: A222397 A334257 A193994 * A266063 A282284 A003349

Adjacent sequences: A097379 A097380 A097381 * A097383 A097384 A097385

KEYWORD

nonn

AUTHOR

Scott C Macfarlan (scottmacfarlan(AT)covance.com), Sep 18 2004

STATUS

approved