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Search: id:A154872
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| A154872 |
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Numbers n such that smallest digit of prime(n) = odd nonprime and largest digit of n = prime. |
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+0
1
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| 5, 7, 13, 20, 30, 31, 32, 33, 35, 37, 45, 47, 53, 54, 67, 105, 112, 113, 115, 121, 125, 133, 135, 152, 157, 167, 200, 201, 202, 203, 205, 207, 210, 211, 215, 217, 220, 221, 222, 225, 227, 230, 231, 232, 233, 235, 237, 245, 247, 250, 251, 255, 257, 270, 271, 272
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OFFSET
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1,1
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EXAMPLE
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If prime(n=5)=11, 5=prime and 1=1=odd nonprime, theh 5=a(1). If prime(n=7)=17, 7=prime and 7>1=odd nonprime, then 7=a(2). If prime(n=13)=41, 1<3=prime and 4>1=odd nonprime, then 13=a(3), etc.
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CROSSREFS
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Cf. A000027, A000040, A141468.
Sequence in context: A129782 A080829 A078884 this_sequence A022319 A167798 A165815
Adjacent sequences: A154869 A154870 A154871 this_sequence A154873 A154874 A154875
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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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