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A108323
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"Binary prime squares": squares whose binary expansions, read as decimal expansions, are primes.
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3
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1101001001, 10111110001, 101000101001, 101011111001, 1000110001001, 1110000111001, 1110110010001, 10110010111001, 100011100110001, 111111111111001, 1000101110001001, 1101011110111001, 1111101000001001, 10101100010010001
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OFFSET
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1,1
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COMMENTS
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Another definition: numbers having only digits 1 and 0 which, read in base 10, are primes, and in base 2 are squares. Derived from A108322 from which the 0-terms have been removed.
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LINKS
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MATHEMATICA
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fd2[n_]:=FromDigits[IntegerDigits[n, 2]]; fd2/@Select[Range[300]^2, PrimeQ[fd2[#]]&](* Harvey P. Dale, Jul 10 2012 *)
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CROSSREFS
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KEYWORD
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easy,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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