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Search: id:A136151
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| A136151 |
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Composites n with exactly two distinct prime divisors, and of the form n=1+(any prime). |
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+0
5
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| 6, 12, 14, 18, 20, 24, 38, 44, 48, 54, 62, 68, 72, 74, 80, 98, 104, 108, 152, 158, 164, 192, 194, 200, 212, 224, 242, 272, 278, 284, 314, 332, 338, 368, 384, 398, 422, 432, 458, 464, 488, 500, 524, 542, 548, 578, 608, 614, 632, 648, 662, 674, 692, 734, 752, 758
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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A008864 INTERSECT A007774. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 01 2008
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MAPLE
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isA136151 := proc(n) if isprime(n-1) then if nops(numtheory[factorset](n)) =2 then true; else false ; fi ; else false ; fi ; end: for i from 1 to 200 do n := ithprime(i)+1 ; if isA136151( n) then printf("%d, ", n) ; fi ; od: - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 01 2008
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CROSSREFS
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Cf. A136152 A136153 A136154 A136155.
Adjacent sequences: A136148 A136149 A136150 this_sequence A136152 A136153 A136154
Sequence in context: A143957 A105115 A136155 this_sequence A056774 A031405 A105773
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KEYWORD
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easy,nonn
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AUTHOR
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Enoch Haga (Enokh(AT)comcast.net), Dec 16 2007
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EXTENSIONS
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Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 01 2008
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