|
| |
|
|
A074040
|
|
Product of first n twin prime pair products.
|
|
2
| |
|
|
15, 525, 75075, 24249225, 21800053275, 38433493923825, 138322144631846175, 716923675626858725025, 7458156997546211316435075, 86984485062381462583582279725, 1656445549042930191979157352803175
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| a(n) = A048599(2*n).
|
|
|
FORMULA
| a(1) = A037074(1) and a(n) = a(n-1)*A037074(n) for n>1.
|
|
|
EXAMPLE
| The first two twin prime pairs are (3,5) and (5*7), their products: 15 and 35, therefore a(2)=15*35=525.
|
|
|
MATHEMATICA
| a = {4, 6, 12, 18, 30, 42, 60, 72, 102, 108, 138, 150} (* A014574 *); Table[ Product[a[[k]]^2 - 1, {k, 1, n}], {n, 1, 12}]
|
|
|
CROSSREFS
| Cf. A074041, A001359, A006512 & A014574.
Sequence in context: A092561 A009068 A157166 * A002403 A077206 A171197
Adjacent sequences: A074037 A074038 A074039 * A074041 A074042 A074043
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 13 2002
|
|
|
EXTENSIONS
| Edited by Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 17 2002
|
| |
|
|
