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Search: id:A154864
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| A154864 |
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Nonprimes n such that largest digit of prime(n) = even. |
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+0
1
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| 1, 14, 18, 38, 42, 56, 60, 76, 82, 84, 86, 90, 93, 110, 112, 115, 116, 117, 119, 121, 124, 138, 141, 142, 143, 144, 147, 148, 150, 152, 153, 154, 172, 178, 192, 194, 195, 208, 218, 221, 224, 234, 235, 236, 250, 252, 255, 261, 276, 279, 280, 282, 284, 285, 286
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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If n=1=nonprime and 2=prime(1), then 2=even and 1=a(1). If n=14=nonprime and 43=prime(14), then 3<4=even and 14=a(2). If 18=nonprime(18) and 61=prime(18), then 1<6=even and 18=a(3), etc.
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MAPLE
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A054055 := proc(n) max( op(convert(n, base, 10))) ; end: isA154864 := proc(n) RETURN(not isprime(n) and ( A054055(ithprime(n)) mod 2 ) = 0 ) ; end: for n from 1 to 400 do if isA154864(n) then printf("%d, ", n) ; fi; od: [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 18 2009]
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CROSSREFS
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Cf. A000040, A141468, A154767.
Sequence in context: A051419 A000053 A079349 this_sequence A065343 A165228 A013649
Adjacent sequences: A154861 A154862 A154863 this_sequence A154865 A154866 A154867
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KEYWORD
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nonn
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AUTHOR
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Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Jan 16 2009
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EXTENSIONS
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36 replaced by 38. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 18 2009
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