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A157485 Numbers n such that n-+1 are divisible by exactly 5 primes, counted with multiplicity. 3
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; refs; listen; history; internal format)
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 * A038655 A108835 A185668

Adjacent sequences:  A157482 A157483 A157484 * A157486 A157487 A157488

KEYWORD

nonn

AUTHOR

Vladimir Orlovsky (4vladimir(AT)gmail.com), Mar 01 2009

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Last modified February 16 07:39 EST 2012. Contains 205881 sequences.