|
| |
|
|
A051335
|
|
Euclid-Mullin sequence (A000945) with initial value a(1)=127 instead of a(1)=2.
|
|
33
|
|
|
|
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
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
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
|
| |
|
|
