OFFSET

1,2

COMMENTS

The sequence of the ratio a(n+1)/a(n) begins with 2, 3, 4, 5, 7, 6, ...

Is a(n+1)/a(n) integer for all n? If that is true, excluding the number 1, is the sequence of the ratio a(n+1)/a(n) a permutation of all other natural numbers?

LINKS

R. L. Graham and N. J. A. Sloane, Anti-Hadamard matrices, Linear Alg. Applic., 62 (1984), 113-137.

CROSSREFS

KEYWORD

nonn,hard,more

AUTHOR

Stefano Spezia, Feb 27 2022

STATUS

approved