The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 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 T. D. Noe, Table of n, a(n) for n = 1..1000 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 Cf. A190390, A190391, A190316. Sequence in context: A246249 A183696 A104963 * A282746 A212854 A186551 Adjacent sequences: A190459 A190460 A190461 * A190463 A190464 A190465 KEYWORD nonn AUTHOR Vladimir Joseph Stephan Orlovsky, May 10 2011 EXTENSIONS Extended by T. D. Noe, May 10 2011 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

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