

A258885


Primitive weird numbers (A002975) having 6 distinct prime factors.


12




OFFSET

1,1


COMMENTS

a(4) <= 5976833582079328 = 2^5*181*197*353*431*34429 and a(5) <= 48083019473926272314825065088 = 2^7*257*97213*97973*100957*1520132521 that is certainly in this sequence.  Giuseppe Melfi, Oct 26 2015
a(4) <= 125258675788784 = 2^4 * 47 * 149 * 353 * 1307 * 2423.  M. F. Hasler, Jul 12 2016


LINKS



EXAMPLE

a(1) = 1550860550 = 2 * 5^2 * 29 * 37 * 137 * 211 = A273815(1). (Abundance = 20)
a(2) = 44257207676 = 2^2 * 11 * 37 * 59 * 523 * 881. (Abundance = 8, cf. A088833)
a(3) = 66072609790 = 2 * 5 * 11 * 127^2 * 167 * 223 = A273815(3). (Abundance = 4, cf. A088832)


MATHEMATICA

(* copy the terms from A002975, assign them to 'lst' and then *)
Select[ lst, PrimeNu@# == 6 &]


PROG

(PARI) select(w>omega(w)==6, A002975) \\ Assuming that A002975 is defined as set or vector.  _M. F. Hasler, Jul 12 2016_


CROSSREFS



KEYWORD

nonn,bref,hard,more


AUTHOR



EXTENSIONS

One more term added and definition corrected by Giuseppe Melfi, Nov 02 2015


STATUS

approved



