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Search: id:A108512
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| A108512 |
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a(n) is number of solutions of equation prime(x)=n*x-1. |
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+0
2
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| 0, 3, 2, 0, 2, 1, 1, 1, 0, 3, 0, 2, 0, 2, 3, 1, 1, 8, 2, 9, 2, 1, 0, 5, 3, 1, 0, 0, 1, 0, 0, 3, 1
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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a(4)=0 because the equation prime(x)=4x-1 has no solution
& a(20)=9 because the length of set of the solutions of equation prime(x)=20x-1 namely length of {69709705,69709719, 9709734,69709873,69709878,69709932,69709935,69709944,69709965} equals 9.
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CROSSREFS
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Cf. A108511, A108513, A108514.
Sequence in context: A118972 A145878 A112606 this_sequence A054503 A122861 A129576
Adjacent sequences: A108509 A108510 A108511 this_sequence A108513 A108514 A108515
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KEYWORD
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more,nonn,new
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AUTHOR
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Farideh Firoozbakht (mymontain(AT)yahoo.com), Jun 13 2005
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EXTENSIONS
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a(29)-a(33) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Nov 15 2009
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