A050507 - OEIS

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A050507

Solutions to sigma(x)+2=sigma(x+2) other than the smaller of twin primes.

434, 8575, 8825 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`This sequence together with A001359 gives the solutions of sigma(x)+2=sigma(x+2).`
	REFERENCES	`Sivaramakrishnan, R. (1989): Classical Theory of Arithmetical Functions, M. Dekker Inc., New York-Basel, p. 81, Problem 12.` `These 3 solutions are from Makowski, according to Sivaramakrishnan, R. (1989).`
	EXAMPLE	`sigma(434)+2=770=sigma(434+2), so 434 is in the sequence.`
	CROSSREFS	`Cf. A000203, A001359, A054799.` `Sequence in context: A055009 A054982 A108785 * A145318 A054987 A054905` `Adjacent sequences: A050504 A050505 A050506 * A050508 A050509 A050510`
	KEYWORD	`nonn,bref`
	AUTHOR	`Jud McCranie (JudMcCranie(AT)ugaalum.uga.edu), Dec 27 1999`
	EXTENSIONS	`No others < 4290000000.` `No others < 50000000000. [From Charles R Greathouse IV (charles.greathouse(AT)case.edu), Oct 19 2010]`

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Last modified February 17 06:13 EST 2012. Contains 205991 sequences.