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A110060 Least positive k such that n^n + k is a Chen prime. 0
1, 1, 2, 1, 12, 23, 4, 73, 100, 19, 450, 281, 114, 241, 56, 51, 582, 527, 412, 771, 230, 997, 440, 95, 1882, 1117, 224, 1213, 1968, 29, 168, 421, 104, 2383, 876, 1085, 5776, 253, 742, 4909, 402, 2045, 3414, 403, 2366, 705, 2124, 6455, 5662, 2329, 1568, 20101 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..52.

MATHEMATICA

(* After loading the NumberTheory package *) SemiPrimeQ[n_] := (f = FactorIntegerECM[n]; PrimeQ[f] && PrimeQ[n/f]); ShenPrimeQ[n_] := (PrimeQ[n] && (PrimeQ[n + 2] || SemiPrimeQ[n + 2])); Do[k = 1; While[ !ShenPrimeQ[n^n + k], k++ ]; Print[k], {n, 100}] (* Ryan Propper, Sep 27 2006 *)

CROSSREFS

Cf. A109611.

Sequence in context: A055392 A045873 A265022 * A061081 A007368 A054677

Adjacent sequences:  A110057 A110058 A110059 * A110061 A110062 A110063

KEYWORD

nonn

AUTHOR

Jason Earls, Sep 04 2005

EXTENSIONS

More terms from Ryan Propper, Sep 27 2006

STATUS

approved

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Last modified April 15 01:24 EDT 2021. Contains 342974 sequences. (Running on oeis4.)