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A220476
Let a(0)=1. For n > 0, a(n) is the least integer greater than a(n-1) such that the polynomial 1/a(0) + x^1/a(1) +...+ x^n/a(n) has exactly n distinct real roots.
0
1, 2, 17, 495, 47208, 14600027, 14610226398, 47283768063238
OFFSET
0,2
EXAMPLE
1+x/2 has 1 real root. Then a(2)=17 is the least value > 2 such that 1+x/2+x^2/a(2) has 2 distinct real roots.
CROSSREFS
Sequence in context: A370704 A373196 A217284 * A293178 A367831 A367829
KEYWORD
nonn,more
AUTHOR
Benoit Cloitre, Dec 15 2012
STATUS
approved