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A242302 Decimal expansion of C(3), where C(x) = -Sum{k>=1} (-1)^k/p_k^x and p_k is the k-th prime. 6
9, 3, 4, 6, 3, 6, 3, 1, 3, 9, 9, 6, 4, 9, 8, 8, 9, 1, 1, 2, 4 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

-1,1

COMMENTS

The alternating series of reciprocal powers of prime numbers converges for any x>0 (absolutely so if x>1) but is hard to compute.

The next digits of C(3), after ...91124, seem to converge to a(20)=9, a(21)= 0.

LINKS

Table of n, a(n) for n=-1..19.

S. Sykora, PARI/GP scripts for primes-related functions, see function AltSum1DivPrimePwr(x,eps), with instruction

EXAMPLE

0.0934636313996498891124...

PROG

(PARI) See Sykora link.

CROSSREFS

Cf. A078437 (x=1), A242301 (x=2), A242303 (x=4), A242304 (x=5).

Sequence in context: A273017 A222233 A021111 * A102754 A225455 A154184

Adjacent sequences:  A242299 A242300 A242301 * A242303 A242304 A242305

KEYWORD

nonn,cons,hard,more

AUTHOR

Stanislav Sykora, May 14 2014

STATUS

approved

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Last modified August 20 09:36 EDT 2017. Contains 290835 sequences.