A109561 a(n) = If[Floor[2*Mod[(Prime[n + 1] - Prime[n])*PrimePi[n]/n, 8]] == 7, Prime[n]]

199, 211, 317, 1381, 1759, 1913, 2161, 2503

Offset

0,1

Links

Table of n, a(n) for n=0..7.

Mathematica

a = Flatten[Table[If[Floor[2*Mod[(Prime[n + 1] - Prime[n])*PrimePi[n]/n, 8]] == 7, Prime[n], {}], {n, 1, 400}]]

Crossrefs

Cf. A001359.

Sequence in context: A151738 A128312 A106628 * A031930 A160342 A225575

Adjacent sequences: A109558 A109559 A109560 * A109562 A109563 A109564

Keyword

nonn

Author

Roger L. Bagula, Jun 27 2005

Status

approved