[seqfan] Definition issues with A121240 and A119523

[Alonso Del Arte]

The formula for A119523 (given in a comment) is "Sum_{ k >= 1}
A010051<http://oeis.org/A010051>
(k)/2^k" (A010051 being the characteristic function of the primes). But my
calculations instead led me to A121240 (the title of which could use a
little de-Mathematica-ization, by the way). To get the value of A119523, it
seems to me that instead of chi_p one should use primepi, and thus
A000720(k)/2^k rather than A010051(k)/2^k in the iterated sum. Just a dozen
iterations are sufficient to get the value to two decimal places. Unless
I've overlooked some small but significant detail.

Al

-- 
Alonso del Arte
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