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m →Constructions: WP:CHECKWIKI error fixes using AWB |
WP:CHECKWIKI error fix #90. Wikipedia being used as a reference or external link. Do general fixes and cleanup if needed. -, typo(s) fixed: Therefore → Therefore, using AWB (12082) |
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==Known Arrays==
* [[Known Costas Arrays]]
==Constructions==
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:3<sup>4</sup> = 81 = 1 (mod 5)
Therefore, [3 4 2 1] is a Costas permutation. More specifically, this is an exponential Welch array. The transposition of the array is a logarithmic Welch array.
The number of Welch–Costas arrays which exist for a given size depends on the [[Euler's totient function|totient function]].
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