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

Author

Charles R Greathouse IV, Jun 19 2016

Keywords

• nonn

Links

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

Crossrefs

Intersection of A005237 and A030632.

Cf. A000005, A274357.

Programs

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)