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URL: https://oeis.org/history?seq=A387618

⇱ The On-Line Encyclopedia of Integer Sequences (OEIS)

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Showing entries 1-10 | older changes
Smallest positive integer k such that there exists an algebraic integer in Q(sqrt(D)) of norm -k, where D = A005117(n) is the n-th squarefree number.
#14 by OEIS Server at Sun Sep 28 15:42:29 EDT 2025
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#13 by Sean A. Irvine at Sun Sep 28 15:42:29 EDT 2025
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Discussion
Sun Sep 28
15:42
OEIS Server: Installed first b-file as b387618.txt.
#12 by Stefano Spezia at Sun Sep 28 14:30:41 EDT 2025
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#11 by Robin Visser at Sat Sep 27 12:34:56 EDT 2025
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#10 by Robin Visser at Sat Sep 27 12:33:18 EDT 2025
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Discussion
Sat Sep 27
12:34
Robin Visser: Added b-file with all terms up to n = 10 000 (computed with the attached Sage code).
#9 by Sean A. Irvine at Wed Sep 10 00:48:46 EDT 2025
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#8 by Michel Marcus at Tue Sep 09 00:26:21 EDT 2025
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#7 by Michel Marcus at Tue Sep 09 00:26:10 EDT 2025
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Discussion
Tue Sep 09
00:26
Michel Marcus: usually like this
#6 by Robin Visser at Mon Sep 08 20:15:20 EDT 2025
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#5 by Robin Visser at Mon Sep 08 19:59:08 EDT 2025
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Discussion
Mon Sep 08
20:14
Robin Visser: This sequence is used to give lower and upper bounds for the sequence A387207 (the maximal norm of an indecomposable element in real quadratic fields), as shown by Jang and Kim.