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 A277777 Largest nontrivial square root of unity modulo the n-th positive integer that does not have a primitive root (A033949). 2
 5, 7, 11, 9, 11, 13, 19, 15, 19, 17, 23, 29, 19, 25, 31, 29, 23, 26, 41, 35, 27, 34, 43, 37, 49, 55, 33, 51, 43, 35, 47, 41, 55, 49, 39, 43, 53, 71, 71, 69, 59, 67, 71, 64, 47, 61, 56, 79, 89, 51, 67, 79, 76, 55, 89, 73, 97, 77, 91, 59, 64, 69, 109, 83, 63, 71 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Alois P. Heinz, Table of n, a(n) for n = 1..10000 FORMULA a(n) = A033949(n) - A082568(n). CROSSREFS Last elements of nonempty rows of A277776. Cf. A033948, A033949, A082568. Sequence in context: A023590 A096919 A023594 * A254930 A317769 A104200 Adjacent sequences:  A277774 A277775 A277776 * A277778 A277779 A277780 KEYWORD nonn,look AUTHOR Alois P. Heinz, Oct 30 2016 STATUS approved

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Last modified June 22 19:28 EDT 2021. Contains 345388 sequences. (Running on oeis4.)