A110067 - OEIS

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A110067

Numbers n such that 10^n + sigma(n) is prime.

1, 2, 4, 242 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`All terms are of the form k^2 or 2*k^2. There is no further term up to 16000.`
	MATHEMATICA	`Do[If[PrimeQ[10^n + DivisorSigma[1, n]], Print[n]], {n, 16000}]`
	CROSSREFS	`Cf. A110065, A110066.` `Sequence in context: A009800 A018742 A018747 * A145996 A005275 A009673` `Adjacent sequences: A110064 A110065 A110066 * A110068 A110069 A110070`
	KEYWORD	`more,nonn`
	AUTHOR	`Farideh Firoozbakht (mymontain(AT)yahoo.com), Jul 12 2005`

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Last modified February 16 03:44 EST 2012. Contains 205860 sequences.