A051335 - OEIS

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A051335

Euclid-Mullin sequence (A000945) with initial value a(1)=127 instead of a(1)=2.

127, 2, 3, 7, 5, 149, 19, 41, 23899, 139, 43, 761, 281, 17, 53, 2551, 23, 20149, 100720363856036298033578901613089271, 31, 179, 11, 13, 523, 282995646721, 2871347, 83, 10744429, 1031, 427773048135533, 97, 78506876242349, 67

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OFFSET

1,1

LINKS

Robert Price, Table of n, a(n) for n = 1..47

MATHEMATICA

a[1]=127; a[n_] := First[ Flatten[ FactorInteger[ 1+Product[ a[ j ], {j, 1, n-1} ] ] ] ]; Array[a, 10]

PROG

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

first(m)={my(v=vector(m)); v[1]=127; for(i=2, m, v[i]=spf(1+prod(j=1, i-1, v[j]))); v; } /* Anders Hellström, Aug 18 2015 */

CROSSREFS

Cf. A000945, A000946, A005265, A005266.

Sequence in context: A281478 A212927 A300785 * A186995 A145586 A340344

Adjacent sequences: A051332 A051333 A051334 * A051336 A051337 A051338

KEYWORD

easy,nonn

AUTHOR

Labos Elemer

STATUS

approved