A203529 v(n)/A000178(n); v=A203527 and A000178=(superfactorials).

1, 5, 175, 44100, 60913125, 427756329000, 20552836095792000, 6952965728817588480000, 11895516181976215338950400000, 99606443887767729350960121600000000, 5830034964946921746536425070101217280000000

Offset

1,2

Comments

It is conjectured that every term of A203529 is an integer.

Links

Table of n, a(n) for n=1..11.

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

Cf. A203527, A203528, A018252, A093883, A203417.

Sequence in context: A060070 A300590 A027873 * A052272 A111515 A157204

Adjacent sequences: A203526 A203527 A203528 * A203530 A203531 A203532

Keyword

nonn

Author

Clark Kimberling, Jan 03 2012

Status

approved