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A203528 a(n) = v(n+1)/v(n), where v=A203527. 3
5, 70, 1512, 33150, 842688, 34594560, 1705017600, 68981673600, 3038555520000, 212396207063040, 16628926183833600, 985240084758930000, 61949330611480166400, 6155242080686899200000, 445283762978503737288000 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
See A093883 for a discussion and guide to related sequences.
LINKS
MATHEMATICA
t = Table[If[PrimeQ[k], 0, k], {k, 1, 100}];
nonprime = Rest[Union[t]] (* A018252 *)
f[j_] := nonprime[[j]]; z = 20;
v[n_] := Product[Product[f[k] + f[j], {j, 1, k - 1}], {k, 2, n}]
d[n_] := Product[(i - 1)!, {i, 1, n}] (* A000178 *)
Table[v[n], {n, 1, z}] (* A203527 *)
Table[v[n + 1]/v[n], {n, 1, z - 1}] (* A203528 *)
Table[v[n]/d[n], {n, 1, 20}] (* A203529 *)
CROSSREFS
Sequence in context: A077691 A277301 A014231 * A147629 A274256 A280574
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Jan 03 2012
EXTENSIONS
Definition corrected by Georg Fischer, Nov 26 2021
STATUS
approved

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Last modified March 28 05:39 EDT 2024. Contains 371235 sequences. (Running on oeis4.)