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A190462 Numbers with prime factorization pqrstu^2v^2. 1
3063060, 3423420, 4144140, 4476780, 5105100, 5225220, 5290740, 5419260, 5585580, 5705700, 6056820, 6404580, 6666660, 6832980, 6906900, 7147140, 7158060, 7304220, 7387380, 7461300, 7636860, 7657650, 7747740, 7987980, 8075340, 8163540, 8314020, 8468460 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Will Nicholes, Prime Signatures
MATHEMATICA
f[n_]:=Sort[Last/@FactorInteger[n]]=={1, 1, 1, 1, 1, 2, 2}; Select[Range[6000000], f]
PROG
(PARI) list(lim)=my(v=List(), t1, t2, t3, t4, t5, t6); forprime(p1=2, sqrtint(lim\60060), t1=p1^2; forprime(p2=2, sqrtint(lim\(2310*t1)), if(p2==p1, next); t2=p2^2*t1; forprime(p3=2, lim\(210*t2), if(p3==p1 || p3==p2, next); t3=p3*t2; forprime(p4=2, lim\(30*t3), if(p4==p1 || p4==p2 || p4==p3, next); t4=p4*t3; forprime(p5=2, lim\(6*t4), if(p5==p1 || p5==p2 || p5==p3 || p5==p4, next); t5=p5*t4; forprime(p6=2, lim\(2*t5), if(p6==p1 || p6==p2 || p6==p3 || p6==p4 || p6==p5, next); t6=p6*t5; forprime(p7=2, lim\t6, if(p7==p1 || p7==p2 || p7==p3 || p7==p4 || p7==p5 || p7==p6, next); listput(v, t6*p7)))))))); Set(v) \\ Charles R Greathouse IV, Aug 25 2016
CROSSREFS
Sequence in context: A246249 A183696 A104963 * A282746 A212854 A186551
KEYWORD
nonn
AUTHOR
EXTENSIONS
Extended by T. D. Noe, May 10 2011
STATUS
approved

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Last modified June 16 22:16 EDT 2024. Contains 373432 sequences. (Running on oeis4.)