OFFSET
0,4
COMMENTS
In calculating this sequence, some backtracking may be needed to ensure that the sequence is unbounded. For instance, one makes the preliminary assignment a(4) = 6, since determinant[1,1,3,6] = 3, a prime greater than the previous determinant prime in A119839: 2. Then one computes a(5) = 23, giving determinant[1,3,6,23] = 5. However, the sequence hits a wall here, as any putative a(6) gives a composite determinant divisible by 3, hence we must backtrack and reassign a(4) = 8. The associated sequence of primes A119839 = 2, 5, 7, 13, 23, 149, 277, 331, 9433, ...
FORMULA
EXAMPLE
a(6) = 87 because of the prime determinant 13 = | 3 8|
|31 87|.
CROSSREFS
KEYWORD
nonn,more,uned
AUTHOR
Jonathan Vos Post, May 25 2006
STATUS
approved