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 A291041 The arithmetic function uhat(n,7,4). 3
 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 7, 13, 8, 13, 9, 13, 10, 7, 11, 13, 8, 13, 13, 9, 7, 13, 10, 13, 8, 11, 13, 7, 9, 13, 13, 13, 8, 13, 7, 13, 11, 9, 13, 13, 8, 7, 10, 13, 13, 13, 9, 11, 7, 13, 13, 13, 10, 13, 13, 7, 8, 13, 11, 13, 13, 13, 7 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The sequence appears to be equal to uhat(n,7,3), at least to 10000 terms. LINKS Bela Bajnok, Additive Combinatorics: A Menu of Research Problems, arXiv:1705.07444 [math.NT], May 2017. See Table in Section 1.6.4. MATHEMATICA delta[r_, k_, d_] := If[r < k, (k - r)*r - (d - 1), If[k < r && r < d, (d - r)*(r - k) - (d - 1), If[k == r && r == d, d - 1, 0]]] uhat[n_, m_,  h_] := (dx = Divisors[n]; dmin = n; For[i = 1, i ≤ Length[dx], i++, d = dx[[i]]; k = m - d*Ceiling[m/d] + d; r = h - d*Ceiling[h/d] + d; If[h ≤ Min[k, d - 1], dmin = Min[dmin, n, (h*Ceiling[m/d] - h + 1)*d, h*m - h*h + 1], dmin = Min[dmin, n, h*m - h*h + 1 - delta[r, k, d]]]]; dmin) Table[uhat[n, 7, 4], {n, 1, 70}] CROSSREFS Cf. A289435, A289436, A289437, A289438, A289439, A289440, A289441. Sequence in context: A043273 A268982 A278065 * A291766 A291579 A331300 Adjacent sequences:  A291038 A291039 A291040 * A291042 A291043 A291044 KEYWORD nonn AUTHOR Robert Price, Aug 16 2017 STATUS approved

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Last modified June 20 06:23 EDT 2021. Contains 345157 sequences. (Running on oeis4.)