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A125839
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a(n) is the smallest number m such that k*m - 1 is prime for all k=3,4,...,n.
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4
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1, 1, 6, 18, 120, 1260, 1485540, 28667100, 28667100, 842889105240, 2747586810150
(list; graph; refs; listen; history; internal format)
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OFFSET
| 3,3
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COMMENTS
| For n > 6, 10 divides a(n). a(12)-a(13) from Farideh Firoozbakht (mymontain(AT)yahoo.com).
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LINKS
| Carlos Rivera, Problems & puzzles.
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EXAMPLE
| a(11)=28667100 because 3*28667100-1, 4*28667100-1, 5*28667100-1, 6*28667100-1, 7*28667100-1, 8*28667100-1, 9*28667100-1, 10*28667100-1 & 11*28667100-1 are prime and 28667100 is the smallest number with this property.
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CROSSREFS
| Cf. A125838, A088651, A088250.
Sequence in context: A007126 A009576 A009580 * A117813 A012758 A003496
Adjacent sequences: A125836 A125837 A125838 * A125840 A125841 A125842
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KEYWORD
| hard,more,nonn
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AUTHOR
| Luke Pebody (luke.pebody(AT)gmail.com), Jan 02 2007
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