A109559 a(n) = If[Floor[2*Mod[(Prime[n + 1] - Prime[n])*PrimePi[n]/n, 8]] == 5, Prime[n]]

23, 31, 283, 337, 409, 421, 547, 577, 631, 661, 797, 997, 1201, 1237, 1307, 1459, 1499, 1511, 1531, 1583, 1709, 1789, 1811, 1889, 2039, 2357, 2423, 2633

Offset

0,1

Links

Table of n, a(n) for n=0..27.

Mathematica

a = Flatten[Table[If[Floor[2*Mod[(Prime[n + 1] - Prime[n])*PrimePi[n]/n, 8]] == 5, Prime[n], {}], {n, 1, 400}]]

Crossrefs

Cf. A001359.

Sequence in context: A105007 A243438 A154291 * A231401 A130825 A087563

Adjacent sequences: A109556 A109557 A109558 * A109560 A109561 A109562

Keyword

nonn

Author

Roger L. Bagula, Jun 27 2005

Status

approved