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Search: id:A140776
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| A140776 |
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A number n is included if (p + n/p) is prime, where p is the largest prime that divides n. |
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3
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| 2, 6, 10, 12, 22, 24, 28, 30, 34, 40, 42, 48, 52, 58, 60, 66, 70, 76, 78, 82, 84, 88, 90, 102, 112, 118, 120, 130, 132, 138, 142, 148, 160, 168, 172, 180, 184, 186, 190, 192, 198, 202, 204, 208, 210, 214, 220, 222, 228, 232, 234, 238, 240, 246, 252, 268, 270, 274
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Leroy Quet, Home Page (listed in lieu of email address)
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EXAMPLE
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The largest prime dividing 48 is 3. Since 3 + 48/3 = 19 is prime, then 48 is included in this sequence.
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MATHEMATICA
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fQ[n_] := Block[{p = Last@ First@ Transpose@ FactorInteger@n}, PrimeQ[p + n/p] == True]; Select[ Range[2, 279], fQ@# &] - Robert G. Wilson v, (rgwv(AT)rgwv.com), May 30 2008
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CROSSREFS
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Cf. A140775, A140777.
Sequence in context: A055743 A071638 A028348 this_sequence A108783 A066679 A086123
Adjacent sequences: A140773 A140774 A140775 this_sequence A140777 A140778 A140779
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet May 29 2008
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EXTENSIONS
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More terms from Robert G. Wilson v, (rgwv(AT)rgwv.com), May 30 2008
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