A274366 Numbers n such that n and n+1 both have 22 divisors.

2200933376, 3724751871, 4982377472, 5055007743, 5828903936, 6506195967, 9771369471, 12238318592, 13810439168, 15213325311, 15503492096, 15624424448, 17027310591, 20703583232, 22590198783, 23194860543, 27596727296, 28274019327, 30136306688, 30450801663

Offset

1,1

Links

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

Prog

(PARI) is(n)=numdiv(n)==22 && numdiv(n+1)==22
(PARI) list(lim)=my(v=List(), t); forprime(p=2, sqrtnint(lim\=1, 21), t=p^21; if(numdiv(t+1)==22, listput(v, t)); if(numdiv(t-1)==22, listput(v, t-1))); forprime(p=3, sqrtnint(lim\3, 10), my(p10=p^10); forprime(q=3, lim\p10, if(p==q, next); t=p10*q; if(numdiv(t+1)==22, listput(v, t)); if(numdiv(t-1)==22, listput(v, t-1)))); Set(v)

Crossrefs

Intersection of A005237 and A137485.

Sequence in context: A017472 A017604 A288080 * A224988 A327056 A180688

Adjacent sequences: A274363 A274364 A274365 * A274367 A274368 A274369

Keyword

nonn

Author

Charles R Greathouse IV, Jun 19 2016

Status

approved