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 A115857 Smallest integer m > n, such that there exists nonzero solutions to a cross-domain congruence n*i = m X i, n if no such integer exists. 9
 1, 2, 7, 4, 13, 14, 11, 8, 25, 26, 31, 28, 21, 22, 19, 16, 49, 50, 23, 52, 29, 62, 47, 56, 41, 42, 31, 44, 37, 38, 35, 32, 97, 98, 39, 100, 61, 46, 63, 104, 105, 58, 59, 124, 53, 94, 55, 112, 81, 82, 55, 84, 93, 62, 59, 88, 73, 74, 63, 76, 69, 70, 67, 64, 193, 194, 71, 196, 77 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Here * stands for ordinary multiplication and X means carryless (GF(2)[X]) multiplication (A048720). LINKS CROSSREFS a(2n) = 2*a(n). Bisection A115858 gives only the odd terms. Differs from A065621 for the first time at n=19, where a(19)=23, while A065621(19)=55. The next differences are a(21)=29 (A065621(21)=61) and a(23)=47 (A065621(23)=59). Cf. A115859, A115861, A115869, A115871, A115872. Sequence in context: A222056 A247448 A102514 * A065621 A036565 A054787 Adjacent sequences:  A115854 A115855 A115856 * A115858 A115859 A115860 KEYWORD nonn AUTHOR Antti Karttunen, Feb 07 2006 STATUS approved

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