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Search: id:A155479
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| A155479 |
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Prime(n) without odd prime digits of n. |
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+0
1
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| 2, 3, 7, 13, 19, 23, 29, 31, 37, 43, 53, 61, 67, 71, 73, 79, 89, 101, 107, 109, 173, 179, 181, 193, 199, 223, 227, 281, 283, 293, 311, 317, 337, 347, 409, 419, 421, 433, 443, 457, 461, 463, 467, 479, 491, 503, 521, 523, 541, 547, 557, 569, 577, 593, 601, 607
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Odd prime digit = 3, 5 or 7.
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EXAMPLE
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If n=1=nonprime and 2=prime(1), then 2=a(1). If n=2=even prime and 3=prime(2), then 3=a(2). If n=4=composite and 7=prime(4), then 7=a(3), etc.
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CROSSREFS
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Cf. A000027, A000040, A002808, A141468.
Sequence in context: A159079 A068947 A068948 this_sequence A019411 A105792 A130903
Adjacent sequences: A155476 A155477 A155478 this_sequence A155480 A155481 A155482
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KEYWORD
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nonn,base
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AUTHOR
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Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Jan 23 2009
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