id:A115989 - OEIS Search Results

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Numbers n such that the average of primes p(n) and p(n+1) is a power of 3.

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4, 22, 20700806, 166677978 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`p(20700806)=387420479, p(20700806+1)=387420499 and (387420479+387420499)/2 = 387420489 = 3^18, so 20700806 belongs to the sequence.`
	CROSSREFS	`Cf. A115986, A115987, A115988.` `Sequence in context: A065401 A053775 A037142 this_sequence A016485 A131545 A030716` `Adjacent sequences: A115986 A115987 A115988 this_sequence A115990 A115991 A115992`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 10 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.