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A216533
Numbers n such that (10^n + 1)/11 is prime, but cannot be written in the form a^2 + 7*b^2.
0
5, 53, 293, 641, 3011
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OFFSET
1,1
COMMENTS
These exponents are congruent to {2, 4, 5} mod 6.
LINKS
Table of n, a(n) for n=1..5.
Samuel S. Wagstaff, Jr.
The Cunningham Project
CROSSREFS
Cf.
A001562
.
Sequence in context:
A058867
A058869
A054342
*
A152473
A242906
A068170
Adjacent sequences:
A216530
A216531
A216532
*
A216534
A216535
A216536
KEYWORD
nonn
AUTHOR
V. Raman
, Sep 08 2012
STATUS
approved
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Last modified May 13 02:41 EDT 2024. Contains 372497 sequences. (Running on oeis4.)