A274358 Numbers n such that n and n+1 both have 14 divisors.

29888, 109375, 436671, 716607, 2829248, 3329343, 3948992, 5195583, 5568831, 8801216, 9767871, 10667456, 10947392, 12347072, 12627008, 14713407, 14959808, 16359488, 17479232, 20032191, 20278592, 20558528, 20965311, 23077952, 23544512, 24109375, 24477632

Offset

1,1

Links

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

Prog

(PARI) is(n)=numdiv(n)==14 && numdiv(n+1)==14
(PARI) list(lim)=my(v=List(), p6, t); forprime(p=2, sqrtnint(lim\2, 6), p6=p^6; forprime(q=2, lim\p6, if(p==q, next); t=p6*q; if(numdiv(t+1)==14, listput(v, t)); if(numdiv(t-1)==14, listput(v, t-1)))); Set(v)

Crossrefs

Intersection of A005237 and A030632.

Cf. A000005, A274357.

Sequence in context: A258755 A251681 A183852 * A235826 A235823 A235581

Adjacent sequences: A274355 A274356 A274357 * A274359 A274360 A274361

Keyword

nonn

Author

Charles R Greathouse IV, Jun 19 2016

Status

approved