This site is supported by donations to The OEIS Foundation.

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A036333 Composite numbers n such that juxtaposition of prime factors of n has length 9. 2
 512, 768, 1152, 1280, 1408, 1664, 1728, 1792, 1920, 2112, 2176, 2432, 2496, 2592, 2688, 2880, 2944, 3168, 3200, 3264, 3520, 3648, 3712, 3744, 3872, 3888, 3968, 4032, 4160, 4320, 4416, 4480, 4576, 4736, 4752, 4800, 4896, 4928, 5248, 5280, 5408, 5440 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The last term is a(84018465) = 997210243 = 9973 * 99991. - Giovanni Resta, Mar 21 2013 Prime factors counted with multiplicity. - Harvey P. Dale, Jul 26 2017 LINKS Nathaniel Johnston, Table of n, a(n) for n = 1..10000 MAPLE isA036333 := proc(n) local d: d:=ifactors(n)[2]: return `if`(not isprime(n) and add(length(d[j][1])*d[j][2], j=1..nops(d))=9, n, NULL): end: seq(isA036333(n), n=2..5440); # Nathaniel Johnston, Jun 22 2011 MATHEMATICA jpf9Q[n_]:=CompositeQ[n]&&Total[IntegerLength[#[[1]]]#[[2]]&/@ FactorInteger[ n]]==9; Select[ Range[6000], jpf9Q] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jul 26 2017 *) CROSSREFS Cf. A036326-A036334. Sequence in context: A248536 A202461 A046311 * A046312 A045033 A066648 Adjacent sequences:  A036330 A036331 A036332 * A036334 A036335 A036336 KEYWORD nonn,base,fini,easy AUTHOR Patrick De Geest, Dec 15 1998. STATUS approved

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

Last modified January 17 10:29 EST 2019. Contains 319218 sequences. (Running on oeis4.)