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A305333
Let p be the n-th base-5 Wieferich prime (
A123692
). a(n) is the value of p-1 divided by the multiplicative order of 5 (mod p^2).
2
1, 2, 1, 4, 1, 1, 16
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..7.
FORMULA
a(n) = (
A123692
(n)-1)/
A305332
(n).
PROG
(PARI) v=[2, 20771, 40487, 53471161, 1645333507, 6692367337, 188748146801]; for(k=1, #v, my(ord=znorder(Mod(5, v[k]^2))); print1((v[k]-1)/ord, ", "))
CROSSREFS
Cf.
A123692
,
A211241
,
A305331
,
A305332
.
Sequence in context:
A068009
A140168
A059119
*
A127772
A086256
A227964
Adjacent sequences:
A305330
A305331
A305332
*
A305334
A305335
A305336
KEYWORD
nonn
,
hard
,
more
AUTHOR
Felix Fröhlich
, May 30 2018
STATUS
approved
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Last modified August 7 06:58 EDT 2024. Contains 375008 sequences. (Running on oeis4.)