Search: id:A147572
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%I A147572
%S A147572 2310,4620,6930,9240,11550,13860,16170,18480,20790,23100,25410,27720,
%T A147572 32340,34650,36960,41580,46200,48510,50820,55440,57750,62370,64680,
%U A147572 69300,73920,76230,80850,83160,92400,97020
%N A147572 Numbers with exactly 5 distinct prime divisors {2,3,5,7,11}
%C A147572 Successive numbers k such that EulerPhi[x]/x = m
%C A147572 ( Family of sequences for successive n primes )
%C A147572 m=1/2 numbers with exactly 1 distinct prime divisor {2} see A000079
%C A147572 m=1/3 numbers with exactly 2 distinct prime divisors {2,3} see A033845
%C A147572 m=4/15 numbers with exactly 3 distinct prime divisors {2,3,5} see A143207
%C A147572 m=8/35 numbers with exactly 4 distinct prime divisors {2,3,5,7} see A147571
%C A147572 m=16/77 numbers with exactly 5 distinct prime divisors {2,3,5,7,11} see 
               A147572
%C A147572 m=192/1001 numbers with exactly 6 distinct prime divisors {2,3,5,7,11,
               13} see A147573
%C A147572 m=3072/17017 numbers with exactly 7 distinct prime divisors {2,3,5,7,
               11,13,17} see A147574
%C A147572 m=55296/323323 numbers with exactly 8 distinct prime divisors {2,3,5,
               7,11,13,17,19} see A147575
%t A147572 a = {}; Do[If[EulerPhi[x]/x == 16/77, AppendTo[a, x]], {x, 1, 100000}]; 
               a (*Artur Jasinski*)
%Y A147572 A060735, A143207, A147571-A147575, A147576-A147580
%Y A147572 Sequence in context: A046387 A136154 A076252 this_sequence A046303 A046403 
               A087978
%Y A147572 Adjacent sequences: A147569 A147570 A147571 this_sequence A147573 A147574 
               A147575
%K A147572 nonn
%O A147572 1,1
%A A147572 Artur Jasinski (grafix(AT)csl.pl), Nov 07 2008

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