id:A027707 - OEIS Search Results

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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.

+0
1

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; listen)

	OFFSET	`0,1`
	MATHEMATICA	`c[ n_ ] := OddQ[ Count[ IntegerDigits[ n, 2 ], 1 ]]; Map[ Prime, Select[ Range[ 200 ], c[ Prime[ # ]]&&c[ Prime[ #+1 ]]& ]]`
	CROSSREFS	`Sequence in context: A153325 A109907 A083363 this_sequence A046861 A078917 A084443` `Adjacent sequences: A027704 A027705 A027706 this_sequence A027708 A027709 A027710`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`
	EXTENSIONS	`More terms from Erich Friedman (erich.friedman(AT)stetson.edu).`

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Last modified December 4 15:11 EST 2009. Contains 170347 sequences.

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