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A256366
Primes arising in A=A256189 as gcd(A(n-2), A(n)), n > 3.
2
2, 3, 2, 3, 5, 3, 5, 2, 5, 2, 3, 7, 3, 7, 2, 5, 11, 5, 11, 2, 3, 13, 17, 13, 17, 3, 2, 19, 2, 19, 2, 5, 2, 5, 2, 5, 2, 5, 23, 3, 23, 2, 23, 29, 3, 29, 2, 7, 2, 7, 2, 3, 2, 3, 31, 3, 31, 2, 31, 2, 3, 2, 11, 2
OFFSET
2,1
COMMENTS
Conjecture: the sequence contains all primes such that the first appearances of them are in the natural order.
Provided all primes appear, they must appear in the natural order. Suppose otherwise: For A=A256189 and some n and primes p < q, q divides a = A(n) but not A(k) for k < n and p does not divide A(k) for k <= n. But then A(n) should be pa/q. - Danny Rorabaugh, Mar 31 2015
LINKS
CROSSREFS
Cf. A256189.
Sequence in context: A327277 A124459 A283360 * A046147 A251865 A306196
KEYWORD
nonn
AUTHOR
Vladimir Shevelev, Mar 26 2015
STATUS
approved