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A027707
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Primes with odd number of 1's in binary expansion such that next prime also has odd number of 1's.
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0
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7, 11, 31, 37, 59, 61, 73, 103, 107, 127, 131, 151, 167, 173, 179, 181, 191, 199, 211, 223, 227, 229, 233, 239, 241, 409, 419, 421, 431, 433, 439, 487, 491, 557, 563, 577, 601, 607, 613, 631, 647, 653, 659, 701, 709, 719, 727, 757, 761, 823, 827, 911, 919
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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MATHEMATICA
| c[ n_ ] := OddQ[ Count[ IntegerDigits[ n, 2 ], 1 ]]; Map[ Prime, Select[ Range[ 200 ], c[ Prime[ # ]]&&c[ Prime[ #+1 ]]& ]]
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CROSSREFS
| Sequence in context: A109907 A121534 A083363 * A046861 A078917 A084443
Adjacent sequences: A027704 A027705 A027706 * A027708 A027709 A027710
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from Erich Friedman (erich.friedman(AT)stetson.edu).
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