id:A065116 - OEIS Search Results

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Numbers n such that sigma(n) +- tau(n) are primes.

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8, 162, 512, 32768, 41472, 3748322, 5120000, 6837602, 8000000 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Intersection of A064205 and A065061.`
	MATHEMATICA	`Do[ds1 = DivisorSigma[1, n]; ds0 = DivisorSigma[0, n]; If[ PrimeQ[ds1 + ds0] && PrimeQ[ds1 - ds0], Print[n]], {n, 1, 10^7} ]`
	CROSSREFS	`Cf. A064205 and A065061.` `Sequence in context: A052140 A064755 A140337 this_sequence A061250 A061711 A075387` `Adjacent sequences: A065113 A065114 A065115 this_sequence A065117 A065118 A065119`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Nov 12 2001`

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Last modified July 4 18:25 EDT 2008. Contains 140886 sequences.