Extending A075880, how to find n for A001481(n)=x for large x

Pfoertner, Hugo Hugo.Pfoertner at muc.mtu.de
Fri Oct 18 11:39:34 CEST 2002

I know that an approximate value of the position in A001481(n)=x can be
computed by the formula by Landau
n ~= K_LR * x / sqrt(ln(x)) with K_LR=0.76422365358922..., the
Landau-Ramanujan constant, which is known to 30010 decimal digits according
but this doesn't help.

Hugo Pfoertner

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