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A231093
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Initial members of abundant octuplets, i.e., values of n such that (n, n+2, n+4, n+6, n+8, n+10, n+12, n+14) are all abundant numbers.
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9
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221355126, 402640540, 668862580, 739577140, 1415514246, 1598558646, 1678915540, 1714512246, 1812156340, 1829740086, 1892686326, 2097915966, 2259080046, 2452774780, 2453605540, 2521418740, 2726361940, 3118553740, 3252749646, 3318076446, 4119153340, 4748101660
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OFFSET
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1,1
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LINKS
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EXAMPLE
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221355126, 221355128, 221355130, 221355132, 221355134, 221355136, 221355138, 221355140 are abundant, thus the smallest number is listed.
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MATHEMATICA
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AbundantQ[n_] := DivisorSigma[1, n] > 2n; m = 0; a = {}; Do[If[AbundantQ[n], m = m + 1; If[m > 7, AppendTo[a, n - 14]], m = 0], {n, 2, 2000000000, 2}]; a
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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