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A355602
a(1) = 61. For n > 1, a(n) = smallest prime q such that q^(a(n-1)-1) == 1 (mod a(n-1)^2).
5
61, 601, 2269, 13499, 58313, 1950827, 57480139, 713589493, 4722480517
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OFFSET
1,1
COMMENTS
Is this overall an increasing sequence or does it enter a cycle?
LINKS
Table of n, a(n) for n=1..9.
PROG
(PARI) seq(start, terms) = my(x=start, i=1); print1(start, ", "); while(1, forprime(q=1, , if(Mod(q, x^2)^(x-1)==1, print1(q, ", "); x=q; i++; if(i >= terms, break({2}), break))))
seq(61, 20) \\ Print initial 20 terms of sequence
CROSSREFS
Row n = 18 of
A249162
.
Cf.
A355597
,
A355598
,
A355599
,
A355600
,
A355601
.
Sequence in context:
A209548
A302898
A234926
*
A069595
A235009
A304764
Adjacent sequences:
A355599
A355600
A355601
*
A355603
A355604
A355605
KEYWORD
nonn
,
hard
,
more
AUTHOR
Felix Fröhlich
, Jul 09 2022
STATUS
approved
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Last modified May 15 03:56 EDT 2024. Contains 372536 sequences. (Running on oeis4.)