A141030 a(n)=If[Prime[n + 1]^2 - Prime[n]*Prime[n + 2] > 0, If[Mod[Prime[n]*Sqrt[5], 1] >= 0.5, 0, 1], If[Mod[Prime[n]*Sqrt[7], 1] >= 0.5, 2, 3]].

3, 0, 3, 0, 3, 1, 2, 3, 1, 2, 1, 0, 3, 2, 1, 0, 3, 1, 0, 2, 1, 3, 2, 1, 0, 3, 1, 3, 3, 0, 3, 0, 3, 0, 3, 0, 1, 3, 1, 0, 2, 0, 3, 0, 3, 0, 0, 0, 2, 2, 1, 3, 0, 1, 0, 1, 2, 0, 1, 3, 2, 1, 1, 2, 3, 0, 2, 0, 3, 3, 2, 0, 0, 1, 2, 3, 0, 3, 2, 0, 2, 1, 3, 1, 3, 3, 0, 0, 2, 2, 1, 1, 3, 0, 3, 2, 1, 3, 1, 3

Offset

1,1

Links

Table of n, a(n) for n=1..100.

Mathematica

f[n_] = If[Prime[n + 1]^2 - Prime[n]*Prime[n + 2] > 0, If[Mod[Prime[n]*Sqrt[5], 1] >= 0.5, 0, 1], If[Mod[Prime[n]*Sqrt[7], 1] >= 0.5, 2, 3]];
Table[f[n], {n, 1, 100}]

Crossrefs

Sequence in context: A053387 A221170 A307199 * A221168 A194084 A262281

Adjacent sequences: A141027 A141028 A141029 * A141031 A141032 A141033

Keyword

nonn,uned,less

Author

Roger L. Bagula, Jul 30 2008

Status

approved