redbaron01's profile - activity

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2016-07-17 01:47:16 +0200	commented answer	Composite Number Sum Error This is brilliant - thank you! Would you recommend switching from RDF to RLF and defining the precision of the real field in a way similar to the below method: `composites = (i for i in NN if i>3 and not i.is_prime()) s = RLF(0); s RealField(300)(s) for i in xrange(0,5000): s += (-1)^i / composites.next() print s`
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2016-07-16 16:04:17 +0200	commented question	Composite Number Sum Error OEIS A269229. The sum of ((-1)^n) / x(n) where x(n) is the next composite (non-prime) number.
2016-07-16 15:45:00 +0200	received badge	● Student (source)
2016-07-16 13:29:20 +0200	asked a question	Composite Number Sum Error New to sage, although familiar with a few other coding langages. Trying to obtain a sum of alternating terms. Any idea on this one? Thanks in advance. `def a(n) : return [k for k in (1..n) if not is_prime(k)] from mpmath import * mp.dps = 15 mp.pretty = True nsum(lambda n: (1)/(a(n)), [1,5000], method='alternating')` Error Received: `TypeError: unable to coerce <type 'sage.libs.mpmath.ext_main.mpf'> to an integer`