A227783 Stufe of Q(sqrt(-k)), where k is the n-th squarefree number.
1, 2, 2, 2, 2, 4, 2, 2, 2, 2, 4, 2, 2, 2, 2, 4, 2, 2, 2, 4, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 4, 2, 2, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 4, 2, 2, 2, 2, 4, 2, 2, 2, 2, 4, 2, 2, 2, 4, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 4, 2, 2, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 4, 2, 2, 2, 4
Offset: 1
Links
- Charles R Greathouse IV, Table of n, a(n) for n = 1..10000
Programs
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PARI
apply(n->if(n%8==7,4,if(n>1,2,1)),select(issquarefree, vector(200,i,i)))
Comments