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A078830
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Numbers having in binary representation exactly one binary substring representing a prime.
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2
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2, 3, 4, 8, 9, 16, 32, 33, 64, 65, 128, 129, 256, 512, 513, 1024, 1025, 2048, 2049, 4096, 4097, 8192, 8193, 16384, 16385, 32768, 32769, 65536, 131072, 131073, 262144, 262145, 524288, 524289, 1048576, 1048577, 2097152, 2097153, 4194304, 4194305
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OFFSET
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1,1
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COMMENTS
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for k>2 also floor(a(k)/2) belongs to the sequence.
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LINKS
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EXAMPLE
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p=2 -> '10' is the only prime contained exactly once in 2^k, k>0.
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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