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!)
 A233819 Least odd integer of each prime signature ordered by prime signatures occurrence. 2
 1, 3, 9, 15, 27, 45, 81, 135, 105, 243, 225, 405, 315, 729, 675, 1215, 945, 2187, 2025, 1575, 3645, 1155, 3375, 2835, 6561, 6075, 4725, 10935, 3465, 10125, 8505, 19683, 18225, 14175, 32805, 10395, 30375, 11025, 25515, 59049, 23625, 54675, 17325, 50625, 42525, 98415, 31185, 91125, 33075, 76545, 177147, 70875 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS a(n) is the least odd integer with the same prime signature of A025487(n). LINKS Amiram Eldar, Table of n, a(n) for n = 1..10000 Will Nicholes, Prime Signatures FORMULA a(n) = A003961(A025487(n)). - Amiram Eldar, Jun 23 2019 EXAMPLE a(7) is the first odd integer with prime signature {1,3} = 3^3*5 = 135 a(8) is the first odd integer with prime signature {1,1,1} = 3*5*7 = 105 CROSSREFS Cf. A003961, A025487, A147516. Sequence in context: A256388 A082897 A147516 * A131822 A131801 A280963 Adjacent sequences:  A233816 A233817 A233818 * A233820 A233821 A233822 KEYWORD nonn AUTHOR Lior Manor, Dec 16 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 16 09:06 EST 2019. Contains 330020 sequences. (Running on oeis4.)