This site is supported by donations to The OEIS Foundation.

 Annual Appeal: Please make a donation to keep the OEIS running. In 2018 we replaced the server with a faster one, added 20000 new sequences, and reached 7000 citations (often saying "discovered thanks to the OEIS"). Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A164000 Main diagonal of array in A163280. 14
 1, 6, 15, 28, 45, 66, 91, 128, 162, 200, 231, 372, 325, 406, 495, 656, 561, 954, 703, 1180, 987, 1078, 1035, 1896, 1375, 1534, 1701, 2324, 1653, 3090, 1891, 3104, 2541, 2686, 3045, 5004, 2701, 3382, 3627, 5560, 3321, 6846, 3655, 6028, 6165, 5014, 4371 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS MAPLE A033676 := proc(n) local a, d; a := 0 ; for d in numtheory[divisors](n) do if d^2 <= n then a := max(a, d) ; end if; end do: a; end proc: A163280 := proc(n, k) local r, T ; r := 0 ; for T from k^2 by k do if A033676(T) = k then r := r+1 ; if r = n then RETURN(T) ; end if; end if; end do: end proc: A164000 := proc(n) A163280(n, n) ; end proc: seq(A164000(n), n=1..60) ; [From R. J. Mathar, Feb 16 2010] CROSSREFS Cf. A008578, A161344, A161345, A163280. Sequence in context: A081873 A096892 A000384 * A212087 A301292 A134978 Adjacent sequences:  A163997 A163998 A163999 * A164001 A164002 A164003 KEYWORD nonn AUTHOR Omar E. Pol, Aug 08 2009 EXTENSIONS Terms from a(13) on by R. J. Mathar, Feb 16 2010 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 11:05 EST 2018. Contains 318148 sequences. (Running on oeis4.)