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A092928 Value of k pertaining to A092927: value of k such that n(n-1)(n-2)...(n-k)+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 (list; graph; refs; listen; history; text; internal format)
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=n-k, n, i)+1; a(n)=for (i=0, n, if(isprime(f(n, i)), print1(i); break()))
CROSSREFS
Sequence in context: A096800 A036586 A359290 * A321090 A219026 A085097
KEYWORD
sign
AUTHOR
Amarnath Murthy, Mar 18 2004
EXTENSIONS
More terms from Mohammed Bouayoun (bouyao(AT)wanadoo.fr), Mar 19 2004
Corrected and extended by Ray Chandler, Mar 23 2004
STATUS
approved

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Last modified June 20 09:16 EDT 2024. Contains 373515 sequences. (Running on oeis4.)