A085231 - OEIS

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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

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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 *)