A219327 - OEIS

%I #33 Oct 19 2021 02:50:45

%S 1,2,3,4,5,6,7,8,9,48,247,370,378,407,481,518,592,629,1360,1547,3075,

%T 26027,26933,45018,69781,80487,123823,154791,289835,1920261,2137616,

%U 2716713,3100883,3480140,3934896,4179451,4830936,5218958,11955168,23203827,80651025,95738203

%N Positive integers k that are equal to the absolute value of the determinant of the circulant matrix formed by the decimal digits of k.

%C Contains A219324 and A219326 as subsequences.

%C Equal to the sequence defined by replacing circulant matrices with left circulant matrices. - _Chai Wah Wu_, Oct 18 2021

%H Robert G. Wilson v and Max Alekseyev, <a href="/A219327/b219327.txt">Table of n, a(n) for n = 1..63</a> (complete up to 10^10)

%o (Python)

%o from sympy import Matrix

%o A219327_list = []

%o for n in range(1,10**6):

%o     s = [int(d) for d in str(n)]

%o     m = len(s)

%o     if n == abs(Matrix(m, m, lambda i, j: s[(i-j) % m]).det()):

%o         A219327_list.append(n) # _Chai Wah Wu_, Oct 18 2021

%Y A219324, the main entry for this sequence, provides references and further details.

%Y Cf. A219326.

%K base,nonn

%O 1,2

%A _Max Alekseyev_, Nov 17 2012

%E a(53)-a(63) from _Max Alekseyev_, Feb 15 2013