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A123488
Smallest prime of the form (q^p-1)/(q-1), where p = prime(n) and q is also prime (q =
A123487
(n)).
3
3, 7, 31, 127, 12207031, 8191, 131071, 524287, 1484520425576434196455942238665054573307722183, 10333327940128053377465393536117755205850522803739374960650929
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OFFSET
1,1
COMMENTS
Corresponding smallest primes q are listed in
A123487
.
a(n) coincides with
A084732
(n) when
A066180
(n) is prime or 0.
LINKS
Table of n, a(n) for n=1..10.
FORMULA
a(n) = (
A123487
(n)^prime(n) - 1) / (
A123487
(n) - 1).
CROSSREFS
Cf.
A123487
,
A066180
,
A084732
.
Sequence in context:
A000668
A136007
A084732
*
A121620
A042271
A000644
Adjacent sequences:
A123485
A123486
A123487
*
A123489
A123490
A123491
KEYWORD
nonn
AUTHOR
Alexander Adamchuk
, Sep 30 2006
STATUS
approved
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Last modified April 25 16:45 EDT 2024. Contains 371989 sequences. (Running on oeis4.)