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 A083528 a(n) = 5^n mod 2*n. 6
 1, 1, 5, 1, 5, 1, 5, 1, 17, 5, 5, 1, 5, 25, 5, 1, 5, 1, 5, 25, 41, 25, 5, 1, 25, 25, 53, 9, 5, 25, 5, 1, 59, 25, 45, 1, 5, 25, 47, 65, 5, 1, 5, 9, 35, 25, 5, 1, 19, 25, 23, 1, 5, 1, 45, 81, 11, 25, 5, 25, 5, 25, 125, 1, 5, 49, 5, 81, 125, 65, 5, 1, 5, 25, 125, 17, 3, 25, 5, 65, 161, 25, 5, 1, 65 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS a(n) = 1 iff n is in A067946. - Robert Israel, Dec 26 2014 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 EXAMPLE a(3) = 5 because 5^3 = 125 and 125 == 5 mod (2 * 3). a(4) = 1 because 5^4 = 625 and 625 == 1 mod (2 * 4). MAPLE seq(5 &^n mod (2*n), n = 1 .. 100); # Robert Israel, Dec 26 2014 MATHEMATICA Table[PowerMod[5, w, 2w], {w, 1, 100}] PROG (MAGMA) [5^n mod(2*n): n in [1..100]]; // Vincenzo Librandi, Jul 31 2011 (PARI) vector(100, n, lift(Mod(5, 2*n)^n)) \\ Michel Marcus, Dec 29 2014 CROSSREFS Cf. A000079, A000244, A000351, A000420, A082511. Cf. A067946, A083529, A083530. Sequence in context: A176260 A098190 A050349 * A056957 A224834 A095118 Adjacent sequences:  A083525 A083526 A083527 * A083529 A083530 A083531 KEYWORD easy,nonn AUTHOR Labos Elemer, Apr 30 2003 STATUS approved

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