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A093168
Primes of the form 30*R_k + 7, where R_k is the repunit (
A002275
) of length k.
4
7, 37, 337, 333337, 3333333333333333333333333333333333333333333337
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OFFSET
1,1
COMMENTS
Primes of the form (3*10^k + 33)/9. -
Vincenzo Librandi
, Nov 16 2010
LINKS
Table of n, a(n) for n=1..5.
Makoto Kamada,
Prime numbers of the form 33...337
.
Index entries for primes involving repunits
CROSSREFS
Cf.
A056680
(corresponding k),
A099411
,
A173766
.
Sequence in context:
A356127
A343568
A173766
*
A330388
A276231
A097493
Adjacent sequences:
A093165
A093166
A093167
*
A093169
A093170
A093171
KEYWORD
nonn
AUTHOR
Rick L. Shepherd
, Mar 26 2004
STATUS
approved
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Last modified March 29 08:13 EDT 2024. Contains 371265 sequences. (Running on oeis4.)