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A036381
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Number of connected numbers (A029827) in the interval [2^(n-1)+1, 2^n].
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1
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0, 0, 0, 1, 0, 5, 8, 21, 42, 89, 180, 361, 720, 1438, 2867, 5696, 11282, 22392, 44340, 87887, 174045, 344719, 682767, 1352375, 2678305, 5305631, 10510870, 20824910, 41264654, 81776998, 162083352, 321295873
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OFFSET
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1,6
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LINKS
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EXAMPLE
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From the 64 numbers with ceiling(log_2(x)) = 7, the following 8 are composite connected numbers: 85, 95, 99, 111, 115, 117, 119, 123. Among the others 13 primes, 4 true prime powers and 39 split numbers can be found.
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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