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A216549
Numbers n such that (10^n-1)/9 is prime, but cannot be written in the form a^2 + 3*b^2.
0
2, 23, 317, 1031, 86453
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OFFSET
1,1
COMMENTS
The exponent is congruent to 2 mod 3.
LINKS
Table of n, a(n) for n=1..5.
Samuel S. Wagstaff, Jr.,
The Cunningham Project
CROSSREFS
Subsequence of
A004023
.
Sequence in context:
A088641
A077203
A173935
*
A091693
A276025
A211925
Adjacent sequences:
A216546
A216547
A216548
*
A216550
A216551
A216552
KEYWORD
nonn
AUTHOR
V. Raman
, Sep 08 2012
STATUS
approved
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Last modified August 30 09:19 EDT 2024. Contains 375532 sequences. (Running on oeis4.)