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A121846 Numbers m such that greatest prime divisor of (m-th prime + 1) is 5. 0
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified July 9 05:17 EDT 2020. Contains 335538 sequences. (Running on oeis4.)