

A092928


Value of k pertaining to A092927: value of k such that n(n1)(n2)...(nk)+1 is the least prime of this form; a(n)=1 if no such k exists, i.e., A092927(n)=0.


5



0, 0, 1, 0, 2, 0, 1, 2, 1, 0, 2, 0, 1, 7, 1, 0, 12, 0, 1, 2, 1, 0, 2, 5, 1, 2, 2, 0, 7, 0, 5, 2, 12, 1, 8, 0, 4, 5, 1, 0, 22, 0, 2, 4, 14, 0, 9, 7, 5, 5, 1, 0, 2, 4, 1, 13, 6, 0, 25, 0, 5, 9, 1, 5, 4, 0, 1, 4, 8, 0, 10, 0, 5, 8, 5, 1, 4, 0, 1, 12, 1, 0, 7, 5, 2, 2, 7, 0, 12, 1, 1, 8, 2, 4, 5, 0, 8, 7, 14, 0
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OFFSET

1,5


COMMENTS

Subsidiary sequence: First occurrence of n in this sequence. 1,3,5,...


LINKS



EXAMPLE

a(8) = 2 as 8*7*6 + 1 = 337 is the least prime of this form.


PROG

(PARI) f(n, k)=prod(i=nk, n, i)+1; a(n)=for (i=0, n, if(isprime(f(n, i)), print1(i); break()))


CROSSREFS



KEYWORD

sign


AUTHOR



EXTENSIONS

More terms from Mohammed Bouayoun (bouyao(AT)wanadoo.fr), Mar 19 2004


STATUS

approved



