A121846 Numbers m such that greatest prime divisor of (m-th prime + 1) is 5.

8, 10, 17, 22, 24, 35, 41, 46, 52, 57, 72, 87, 92, 95, 109, 128, 140, 204, 207, 228, 239, 256, 303, 357, 393, 417, 430, 558, 646, 669, 685, 712, 950, 1117, 1198, 1315, 1389, 1454, 1526, 1543, 1600, 1794, 2140, 2289, 2312, 2425, 2571, 2851, 3368, 3613, 3824

Offset

1,1

Comments

Or, position of 5 in A023509 Greatest prime divisor of n-th prime + 1.

Links

Table of n, a(n) for n=1..51.

Formula

A023509(m)=5.

Mathematica

Reap[Do[If[FactorInteger[Prime[n]+1][[ -1, 1]]==5, Sow[n]], {n, 5000}]][[2, 1]]

Crossrefs

Cf. A023509.

Sequence in context: A061908 A056020 A049510 * A059094 A302166 A287270

Adjacent sequences: A121843 A121844 A121845 * A121847 A121848 A121849

Keyword

nonn

Author

Zak Seidov, Sep 09 2006

Status

approved