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A165132 Primes whose logarithms are known to possess ternary BBP formulas 3
2, 3, 5, 7, 11, 13 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Contribution from Jaume Oliver Lafont, Oct 07 2009: (Start)

log(2)=(2/3)P(1,9,2,(1,0))

log(3)=(1/9)P(1,9,2,(9,1))

log(5)=(4/27)P(1,3^4,4,(9,3,1,0))

log(7)=(1/3^5)P(1,3^6,6,(405,81,72,9,5,0))

log(11)=(1/(2*3^9))P(1,3^10,10,(85293,10935,9477,1215,648,135,117,15,13,0))

log(13)=(1/3^5)P(1,3^6,6,(567,81,36,9,7,0))

See the reference for the definition of P notation.

Equivalent expressions in reduced coefficients are given in the code section.

(End)

LINKS

Table of n, a(n) for n=1..6.

David H. Bailey, A Compendium of BBP-formulas for mathematical constants [From Jaume Oliver Lafont, Oct 07 2009]

PROG

Contribution from Jaume Oliver Lafont, Oct 07 2009: (Start)

(PARI) log2=2*suminf(k=1, [0, 1][k%2+1]/k/3^k)

log3=suminf(k=1, [1, 3][k%2+1]/k/3^k)

log5=4*suminf(k=1, [0, 1, 1, 1][k%4+1]/k/3^k)

log7=suminf(k=1, [0, 5, 3, 8, 3, 5][k%6+1]/k/3^k)

log11=suminf(k=1, [0, 13, 5, 13, 5, 8, 5, 13, 5, 13][k%10+1]/k/3^k)/2

log13=suminf(k=1, [0, 7, 3, 4, 3, 7][k%6+1]/k/3^k)

(End)

CROSSREFS

Cf. A104885.

Sequence in context: A205667 A241506 * A193063 A039715 A039714 A039713

Adjacent sequences:  A165129 A165130 A165131 * A165133 A165134 A165135

KEYWORD

more,nonn

AUTHOR

Jaume Oliver Lafont, Sep 04 2009

STATUS

approved

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Last modified December 12 18:24 EST 2018. Contains 318081 sequences. (Running on oeis4.)