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 A231629 First of 7 consecutive deficient numbers in arithmetic progression. 2
 801339, 962649, 7353339, 21964299, 41642139, 48049689, 55455939, 89034939, 89851449, 92253849, 105259539, 107948379, 109455339, 114295449, 116754939, 122349369, 135575979, 156009849, 159521049, 173645439, 188586699, 192674169, 193137849, 220301769, 221355125 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Shyam Sunder Gupta, Table of n, a(n) for n = 1..126 EXAMPLE 801339, 801341, 801343, 801345, 801347, 801349, 801351 is the smallest set of 7 consecutive deficient numbers in arithmetic progression so 801339 is in the list. MATHEMATICA DefQ[n_] := DivisorSigma[1, n] < 2 n; m = 2; z1 = 2; cd = 1; a = {}; Do[If[DefQ[n], If[n - z1 == cd, m = m + 1; If[m > 6, AppendTo[a, n - 6*cd]], m = 2; cd = n - z1]; z1 = n], {n, 3, 1000000000}]; a CROSSREFS Cf. A005100, A231623, A228964, A231624, A231625, A231626, A231628. Sequence in context: A106781 A112451 A235006 * A231090 A237298 A069338 Adjacent sequences: A231626 A231627 A231628 * A231630 A231631 A231632 KEYWORD nonn AUTHOR Shyam Sunder Gupta, Nov 11 2013 STATUS approved

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Last modified September 7 19:53 EDT 2024. Contains 375749 sequences. (Running on oeis4.)