bibkey: sun2013oeisa228884
authors: Zhi-Wei Sun
year: 2013
title: Determinant of the n X n matrix with (i,j)-entry equal to the greatest common divisor of i-j and n
doi: null
url: https://oeis.org/A228884/internal
claim: OEIS A228884 COMMENTS clause (ii) conjectures that for any composite number n, all prime divisors of a(n) are smaller than n.
strata_touched: []
license: citation-only
triage: anchor

Zhi-Wei Sun, OEIS A228884

The source is OEIS A228884, revision 17. Its comment states: “(ii) For any composite number n, all prime divisors of a(n) are smaller than n.” Its NAME is “Determinant of the n X n matrix with (i,j)-entry equal to the greatest common divisor of i-j and n.” Its Mathematica program is “a[n_]:=Det[Table[GCD[i-j,n],{i,1,n},{j,1,n}]]”. Both indices range from 1 through n, and subtraction takes place in the integers.

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DOI: null

Source: https://oeis.org/A228884/internal