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A296352 List of numbers k such that the determinant of the Unordered Lights Out matrix UBL_k is nonzero. 3
3, 4, 7, 8, 9, 11, 13, 14, 16, 17, 19, 21, 22, 23, 26, 27, 28, 29, 31, 32, 33, 34, 37, 38, 39, 41, 43, 44, 46, 47, 49, 51, 52, 53, 56, 57, 58, 59, 61, 62, 63, 64, 67, 68, 69, 71, 73, 74, 76, 77, 79, 81, 82, 83, 86, 87, 88, 89, 91, 92, 93, 94, 97, 98, 99, 101, 103 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..67.

Martin Kreh, "Lights Out" and Variants, Amer. Math. Month., Vol. 124 (10), Dec. 2017, pp. 937-950.

FORMULA

Numbers m > 2 such that m is not divisible by 5 nor by 6. - Amiram Eldar, May 13 2020

MATHEMATICA

Select[Range[3, 120], Mod[#, 5] > 0 && Mod[#, 6] > 0 &] (* Amiram Eldar, May 13 2020 *)

CROSSREFS

Cf. A296350, A296351, A296353.

Presumably the similarity to A074215 is merely coincidental.

Sequence in context: A075821 A120515 A047545 * A192052 A187230 A187901

Adjacent sequences:  A296349 A296350 A296351 * A296353 A296354 A296355

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Dec 14 2017

EXTENSIONS

More terms from Amiram Eldar, May 13 2020

STATUS

approved

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Last modified September 29 04:06 EDT 2020. Contains 337420 sequences. (Running on oeis4.)