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(Greetings from
The On-Line Encyclopedia of Integer Sequences
!
)
A134722
Bisection of Mersenne primes
A000668
.
3
7, 127, 131071, 2147483647, 618970019642690137449562111
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OFFSET
1,1
LINKS
Table of n, a(
n
) for n=1..5.
FORMULA
a(
n
) =
A000668
(2*n).
EXAMPLE
a(
3
) = 131071 because the (2*3=6)th Mersenne prime is 131071.
CROSSREFS
Cf.
A000668
,
A134721
.
Sequence in context:
A253851
A077585
A261487
*
A053713
A077586
A277634
Adjacent sequences:
A134719
A134720
A134721
*
A134723
A134724
A134725
KEYWORD
easy
,
nonn
AUTHOR
Omar E. Pol
, Nov 11 2007
STATUS
approved
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