A303367 - OEIS

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A303367

Numbers equal to the determinant of a circulant matrix based on the base-7 digits of n.

1, 2, 3, 4, 5, 6, 27, 81, 133, 143, 144, 152, 190, 209, 250, 1125, 8569, 10934, 16401, 237568, 362306, 391257, 695751, 723260, 5294625, 6056974, 6332291, 6523631, 6669475, 11128547, 12486285, 17417491, 18682225, 19429514, 19781014, 20924092, 21671381

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Base 7 variant of A219327. See A303366 .. A303369 for other bases.

LINKS

Table of n, a(n) for n=1..37.

EXAMPLE

133 is in the sequence because 133 = 250[7] (in base 7) and 133 = det [2,5,0; 0,2,5; 5,0,2].

PROG

(PARI) (c(v)=abs(matdet(matrix(#v, #v, i, j, v[(j-i)%#v+1])))); for(n=1, oo, n==c(digits(n, 7))&&print1(n", "))

CROSSREFS

Cf. A303366 (base 6), A303368 (base 8), A303369 (base 9), A219327 (base 10).

Sequence in context: A359224 A262434 A246908 * A037332 A091690 A024640

Adjacent sequences: A303364 A303365 A303366 * A303368 A303369 A303370

KEYWORD

nonn,base

AUTHOR

M. F. Hasler, May 05 2018

EXTENSIONS

a(25)-a(37) from Giovanni Resta, May 07 2018

STATUS

approved