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A051322 Euclid-Mullin sequence (A000945) with initial value a(1)=61 instead of a(1)=2. 1

%I #21 Oct 09 2023 14:30:26

%S 61,2,3,367,7,5,1217,17,13,59,3271,19,11,76938833,337,10711,1021,31,

%T 83,1290503,15608141,195648590992627,109,

%U 15983112328343713807564263439978033717550587578630760604057976854157331

%N Euclid-Mullin sequence (A000945) with initial value a(1)=61 instead of a(1)=2.

%H Tyler Busby, <a href="/A051322/b051322.txt">Table of n, a(n) for n = 1..42</a> (terms 1..33 from Robert Price)

%t a[1]=61; a[n_] := First[ Flatten[ FactorInteger[ 1+Product[ a[ j ], {j, 1, n-1} ] ] ] ]; Array[a, 10]

%o (PARI) spf(n)=my(f=factor(n)[1, 1]); f

%o first(m)=my(v=vector(m)); v[1]=61; for(i=2, m, v[i]=spf(1+prod(j=1, i-1, v[j]))); v \\ _Anders Hellström_, Dec 04 2015

%Y Cf. A000945, A000946, A005265, A005266.

%K nonn

%O 1,1

%A _Labos Elemer_

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Last modified March 28 13:42 EDT 2024. Contains 371254 sequences. (Running on oeis4.)