This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A228174 Numbers representable as x^x * y^y, with x > y > 1. 0
 108, 1024, 6912, 12500, 84375, 186624, 800000, 1259712, 3294172, 11943936, 22235661, 67108864, 145800000, 210827008, 452984832, 1549681956, 2573571875, 4294967296, 10460353203, 38423222208, 40000000000, 52428800000, 99179645184, 270000000000, 782757789696 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A subsequence of A156223. LINKS EXAMPLE a(7) = 4^4 * 5^5 = 800000. MATHEMATICA nn = 12; Select[Rest[Union[Flatten[Table[If[x > y, x^x*y^y, 0], {x, 3, nn}, {y, 2, nn - 1}]]]], # <= 4*nn^nn &] (* T. D. Noe, Nov 04 2013 *) CROSSREFS Cf. A000312, A156223. Sequence in context: A202194 A203373 A292343 * A184201 A101213 A202608 Adjacent sequences:  A228171 A228172 A228173 * A228175 A228176 A228177 KEYWORD nonn AUTHOR Alex Ratushnyak, Nov 02 2013 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 December 15 04:23 EST 2019. Contains 329991 sequences. (Running on oeis4.)