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Search: id:A108511
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| A108511 |
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a(n) is the smallest number m such that prime(m)=n*m-1, or 0 if no such m exists. |
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+0
2
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| 0, 2, 1, 0, 70, 182, 440, 1053, 0, 6458, 0, 40087, 0, 251737, 637320, 1617173, 4124466, 10553445, 27067100, 69709705, 179992910, 465769811, 0, 3140421738, 8179002128, 21338685403, 0, 0, 382465573528, 0, 0, 6935812012545, 18262325820324
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OFFSET
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1,2
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COMMENT
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A108512(n) gives number of solutions of the equation prime(x)=n*x-1.
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EXAMPLE
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a(26)=21338685403 because prime(21338685403)=26*21338685403-1 and 21338685403 is the smallest (only) number m with this property.
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CROSSREFS
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Cf. A108512, A108513, A108514.
Sequence in context: A051652 A077019 A139037 this_sequence A086073 A053622 A016408
Adjacent sequences: A108508 A108509 A108510 this_sequence A108512 A108513 A108514
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KEYWORD
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nonn
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AUTHOR
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Farideh Firoozbakht (mymontain(AT)yahoo.com), Jun 12 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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