A085231 In canonical prime factorization: power of smallest prime factor is greater than power of greatest prime factor.

12, 24, 40, 45, 48, 56, 63, 80, 96, 112, 120, 135, 144, 160, 168, 175, 176, 189, 192, 208, 224, 240, 275, 280, 288, 297, 315, 320, 325, 336, 351, 352, 360, 384, 405, 416, 425, 448, 459, 475, 480, 504, 513, 528, 539, 544, 560, 567, 575, 576, 608, 621, 624

Offset

1,1

Comments

A028233(a(n))>A053585(a(n));

p*a(n) is a term for all primes p with A020639(a(n))<p < A006530(a(n)).

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Example

240 = 2^4 * 3 * 5 with 2^4=16 > 5, therefore 240 is a term.

Mathematica

pfgQ[n_]:=Module[{fe=#[[1]]^#[[2]]&/@FactorInteger[n]}, fe[[1]]>fe[[-1]]]; Select[Range[700], pfgQ] (* Harvey P. Dale, Dec 11 2017 *)

Crossrefs

Cf. A085232.

Sequence in context: A140831 A126855 A102749 * A057715 A357863 A053990

Adjacent sequences: A085228 A085229 A085230 * A085232 A085233 A085234

Keyword

nonn

Author

Reinhard Zumkeller, Jun 22 2003

Status

approved