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A203703 Vandermonde sequence using x^2 + xy + y^2 applied to the first n primes. 3
1, 19, 36309, 20948005533, 24919574917127246811, 37290617923502980706808072360699, 314561785062386659424554771537320893773619041293, 7385768555672581968376838404040832050105039776598686978378826098029 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

See A093883 for a discussion and guide to related sequences.

LINKS

Table of n, a(n) for n=1..8.

MATHEMATICA

f[j_] := Prime[j]; z = 11;

u := Product[f[j]^2 + f[j] f[k] + f[k]^2, {j, 1, k - 1}]

v[n_] := Product[u, {k, 2, n}]

Table[v[n], {n, 1, z}]          (* A203703 *)

Table[v[n + 1]/v[n], {n, 1, z}] (* A203704 *)

CROSSREFS

Sequence in context: A233105 A013528 A172762 * A068734 A216529 A145851

Adjacent sequences:  A203700 A203701 A203702 * A203704 A203705 A203706

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 05 2012

STATUS

approved

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Last modified March 5 15:22 EST 2021. Contains 341825 sequences. (Running on oeis4.)