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 A229311 Primitive numbers in A229307. 17
 3, 10, 55, 136, 253, 406, 1081, 1378, 1711, 2485, 3403, 3916, 5671, 6328, 8515, 9316, 11026, 13861, 14878, 15931, 18145, 19306, 25651, 27028, 28441, 31375, 32896, 34453, 36046, 42778, 48205, 50086, 60031, 62128, 64261, 73153, 75466, 87571, 92665, 97903 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Robert G. Wilson v, Table of n, a(n) for n = 1..67 Jose María Grau, A. M. Oller-Marcen, and J. Sondow, On the congruence 1^n + 2^n +... + n^n = d (mod n), where d divides n MATHEMATICA g[n_] := Mod[Sum[PowerMod[i, n, n], {i, 1, n}], n]; tachar[lis_, num_] := Select[lis, ! IntegerQ[#1/num] &]; primi[{}]={}; primi[lis_] := Join[{lis[[1]]}, primi[tachar[lis, lis[[1]]]]]; primi@Select[Range[500], !g[2*#] == # &] CROSSREFS Cf. A014117 (numbers n such that A031971(n)==1 (mod n)). Cf. A229300 (numbers n such that A031971(1806*n)== n (mod n*1806)). Cf. A229301 (numbers n such that A031971(42*n) == n (mod 42*n)). Cf. A229302 (numbers n such that A031971(6*n) == n (mod 6*n)). Cf. A229303 (numbers n such that A031971(2*n) == n (mod 2*n)). Cf. A229304 (numbers n such that A031971(1806*n) <> n (mod n*1806)). Cf. A229305 (numbers n such that A031971(42*n) <> n (mod 42*n)). Cf. A229306 (numbers n such that A031971(6*n) <> n (mod 6*n)). Cf. A229307 (numbers n such that A031971(2*n) <> n (mod 2*n)). Cf. A229308 (primitive numbers in A229304). Cf. A229309 (primitive numbers in A229305). Cf. A229310 (primitive numbers in A229306). Cf. A229311 (primitive numbers in A229307). Sequence in context: A074503 A318188 A301920 * A208480 A034234 A284645 Adjacent sequences:  A229308 A229309 A229310 * A229312 A229313 A229314 KEYWORD nonn AUTHOR José María Grau Ribas, Sep 24 2013 STATUS approved

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Last modified August 25 09:38 EDT 2019. Contains 326323 sequences. (Running on oeis4.)