This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A093394 GCD of n and the product of the anti-divisors of n. 2
 1, 1, 1, 2, 1, 1, 3, 2, 1, 4, 1, 2, 15, 1, 1, 6, 1, 4, 21, 2, 1, 8, 5, 2, 27, 4, 1, 30, 1, 1, 33, 2, 35, 12, 1, 2, 39, 8, 1, 42, 1, 4, 45, 2, 1, 16, 7, 10, 51, 4, 1, 54, 55, 8, 57, 2, 1, 60, 1, 2, 63, 1, 65, 66, 1, 4, 69, 70, 1, 24, 1, 2, 75, 4 (list; graph; refs; listen; history; text; internal format)
 OFFSET 3,4 COMMENTS See A066272 for definition of anti-divisor. LINKS FORMULA a(n) = GCD(n, A091507(n)) EXAMPLE The anti-divisors of 18 are 4, 5, 7, 12. Hence a(18) = GCD(4*5*7*12, 18) = 6. CROSSREFS Cf. A066417, A091507, A093395, A093396. Sequence in context: A296150 A079673 A124829 * A094363 A124832 A226130 Adjacent sequences:  A093391 A093392 A093393 * A093395 A093396 A093397 KEYWORD nonn AUTHOR Lior Manor Mar 28 2004 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 February 16 19:49 EST 2019. Contains 320167 sequences. (Running on oeis4.)