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Search: id:A157139
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| A157139 |
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Odd numbers n with equal number of odd digits in n and n-th prime. |
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+0
1
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| 3, 9, 11, 17, 23, 31, 35, 39, 49, 51, 55, 59, 61, 73, 77, 87, 89, 95, 97, 99, 101, 105, 107, 123, 125, 127, 129, 131, 133, 137, 139, 141, 147, 149, 157, 159, 161, 163, 169, 171, 173, 175, 177, 181, 195, 199, 235, 237, 253, 257, 279, 309, 319, 341, 343, 347, 351
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Odd digits are 1, 3, 5, 7 or 9.
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EXAMPLE
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If prime(n=3=odd number)=5 and 1(3=odd digit)=1(5=odd digit), then 3=a(1). If prime(n=9=odd number)=23 and 1(9=odd digit)=1(3=odd digit), then 9=a(2). If prime(n=11=odd number)=31 and 2(1=odd digit and 1=odd digit)=2(3=odd digit and 1=odd digit), then 11=a(3), etc.
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CROSSREFS
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Cf. A000027, A000040, A155548.
Sequence in context: A131859 A096187 A047471 this_sequence A050538 A062227 A111324
Adjacent sequences: A157136 A157137 A157138 this_sequence A157140 A157141 A157142
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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), Feb 24 2009
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