hihi, all - i get different values from the original after a while (though my results agree with Fred Helenius' as far as he included them), but the original question appears to be intact (not just that the a[m] are all different, but whether they form a permutation of the positive integers) On Fri, 13 Feb 2004, Leroy Quet wrote:
Let a(1) = 1;
Let a(m) be the lowest yet unpicked positive integer such that:
sum{k=1 to m} k* a(k)
is a prime.
a[1] = 1, sum = 1 a[2] = 2, sum = 5 a[3] = 4, sum = 17 a[4] = 3, sum = 29 a[5] = 6, sum = 59 a[6] = 5, sum = 89 a[7] = 12, sum = 173 a[8] = 7, sum = 229 a[9] = 16, sum = 373 ****different from here on**** more soon, cal Chris Landauer Aerospace Integration Science Center The Aerospace Corporation cal@aero.org