id:A157485 - OEIS Search Results

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Numbers n such that n-+1 are divisible by exactly 5 primes, counted with multiplicity.

+0
4

271, 593, 701, 751, 919, 1169, 1241, 1639, 1649, 1673, 1711, 1751, 2071, 2311, 2393, 2549, 2551, 2609, 2729, 2861, 2863, 2897, 2899, 3185, 3331, 3569, 3631, 3823 (list; graph; listen)

	OFFSET	`1,1`
	MATHEMATICA	`q=5; lst={}; Do[If[Plus@@Last/@FactorInteger[n-1]==q&&Plus@@Last/@FactorInteger[n+1]==q, AppendTo[lst, n]], {n, 7!}]; lst`
	CROSSREFS	`Cf. A124936, A014612, A157483, A157484` `Sequence in context: A090838 A086708 A142637 this_sequence A038655 A108835 A005933` `Adjacent sequences: A157482 A157483 A157484 this_sequence A157486 A157487 A157488`
	KEYWORD	`nonn`
	AUTHOR	`Vladimir Orlovsky (4vladimir(AT)gmail.com), Mar 01 2009`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

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