The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A203417 A203415(n)/A000178(n). 5
 1, 3, 15, 140, 700, 2520, 44352, 2196480, 47567520, 634233600, 51753461760, 13984935444480, 1448751906201600, 82605199597240320, 32797812715211980800, 5296846753506734899200, 483765735240908144640000, 28985693293514522492928000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS R. Chapman, A polynomial taking integer values, Mathematics Magazine 29 (1996), p. 121. MATHEMATICA t = Table[If[PrimeQ[k], 0, k], {k, 1, 100}]; nonprime = Rest[Union[t]]; f[j_] := nonprime[[j]]; z = 20;  (* A018252 *) v[n_] := Product[Product[f[k] - f[j], {j, 1, k - 1}], {k, 2, n}] d[n_] := Product[(i - 1)!, {i, 1, n}] Table[v[n], {n, 1, z}]              (* A203415 *) Table[v[n + 1]/v[n], {n, 1, z - 1}] (* A203416 *) Table[v[n]/d[n], {n, 1, 20}]        (* A203417 *) CROSSREFS Cf. A203415, A203416, A000040, A018252. Sequence in context: A179470 A270524 A179471 * A086228 A288456 A230367 Adjacent sequences:  A203414 A203415 A203416 * A203418 A203419 A203420 KEYWORD nonn AUTHOR Clark Kimberling, Jan 01 2012 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 23 07:09 EST 2022. Contains 350506 sequences. (Running on oeis4.)