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Search: id:A067024
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| A067024 |
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Smallest prime p such that p+2 has n distinct prime-factors. |
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+0
8
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| 2, 13, 103, 1153, 15013, 255253, 4849843, 111546433, 4360010653, 100280245063, 5245694198743, 152125131763603, 7149881192889433, 421842990380476663, 16294579238595022363
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OFFSET
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1,1
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FORMULA
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a(n) = Min{p; A001221[p+2]=n}
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EXAMPLE
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For n = 1,...,7 the factors of 2+a(n) are as follows: 2.2, 3.5, 3.5.7, 3.5.7.11, 3.5.7.11.13, 3.5.7.11.13.17, 3.5.7.11.13.17.19; i.e. a[n] = A002110(n+1)/2 which is prime for n = 2,..,7.
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CROSSREFS
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Cf. A001221, A002110, A067023, A053705.
Sequence in context: A125589 A007809 A103513 this_sequence A083062 A127746 A069100
Adjacent sequences: A067021 A067022 A067023 this_sequence A067025 A067026 A067027
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Dec 29 2001
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EXTENSIONS
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a(8)-a(15) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Jan 21 2009
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