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A056831 LCM of composite numbers falling between n-th and (n+1)-st primes. 2
4, 6, 360, 12, 1680, 18, 4620, 491400, 30, 1884960, 29640, 42, 45540, 12994800, 45821160, 60, 89369280, 164220, 72, 211110900, 265680, 195878760, 83434347360, 485100, 102, 578760, 108, 683760, 97661867698205811000, 1073280, 1799665560 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

T. D. Noe, Table of n, a(n) for n=2..1000

FORMULA

a(n) = LCM[p(n)+1, ..., p(n)+d(n)-1], where d(n) = p(n+1) - p(n), n>1

EXAMPLE

For d=2, a(n) is the average of twin prime pairs (A014574). Roughly, a(n) is a polynomial function of p of degree d-1.

MATHEMATICA

Table[LCM@@Range[Prime[n]+1, Prime[n+1]-1], {n, 2, 50}]

CROSSREFS

Cf. A014574, A001359.

Sequence in context: A076098 A141568 A113838 * A027717 A035481 A323214

Adjacent sequences:  A056828 A056829 A056830 * A056832 A056833 A056834

KEYWORD

nonn,easy

AUTHOR

Labos Elemer, Aug 30 2000

EXTENSIONS

Edited by Robert G. Wilson v, Apr 12 2002

STATUS

approved

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Last modified October 13 20:38 EDT 2019. Contains 327981 sequences. (Running on oeis4.)