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A240546 a(n) = prime(n+1)^n mod prime(n). 2

%I #27 Sep 08 2022 08:46:07

%S 1,1,3,4,10,1,9,5,16,9,26,10,33,1,2,49,33,3,35,48,3,32,62,64,4,20,8,

%T 62,93,83,64,41,68,79,138,125,88,56,4,169,72,36,40,144,73,140,63,120,

%U 24,218,67,48,58,194,126,54,74,223,74,59,176,161,280,208,215,236,82,141,139,344,7

%N a(n) = prime(n+1)^n mod prime(n).

%C (prime(k+1)^k mod prime(k)) = k: 1, 3, 4, 76, 7743, ... .

%H Alois P. Heinz, <a href="/A240546/b240546.txt">Table of n, a(n) for n = 1..10000</a>

%e a(5) = prime(5+1)^5 mod prime(5) = 13^5 mod 11 = 10.

%p a:= n-> ithprime(n+1) &^n mod ithprime(n):

%p seq(a(n), n=1..100); # _Alois P. Heinz_, Apr 30 2014

%t Table[Mod[Prime[n + 1]^n, Prime[n]], {n, 80}] (* _Alonso del Arte_, Apr 11 2014 *)

%t Table[PowerMod[Prime[n+1],n,Prime[n]],{n,80}] (* _Harvey P. Dale_, Jun 11 2019 *)

%o (Magma) [(NthPrime(n+1)^n mod NthPrime(n)): n in [1..100]]; // _Juri-Stepan Gerasimov_, Apr 07 2014

%o (PARI) a(n)=my(p=prime(n)); lift(Mod(nextprime(p+1),p)^n) \\ _Charles R Greathouse IV_, Apr 08 2014

%Y Cf. A038702.

%K nonn,less

%O 1,3

%A _Irina Gerasimova_, Apr 07 2014

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Last modified June 1 14:53 EDT 2024. Contains 373025 sequences. (Running on oeis4.)