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 A099638 a[n]=A098210[n]/15. 1
 1, 77, 7437, 741037, 74077037, 7407437037, 740741037037, 74074077037037, 7407407437037037, 740740741037037037, 74074074077037037037, 7407407407437037037037, 740740740741037037037037 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Patterned-digit obtained when (1,5)-half-repdigit is divided by 15, the least such number.This simple generating rule is often[not always] applicable to provide curious digit-patterns. Thus A=1,B=7 give 111..888 numbers divided by 18 results in A003555. LINKS Table of n, a(n) for n=1..13. FORMULA a[n]=A*(((100^n-1)/9)+B*(10^n - 1)/9)/15, where A=1, B=5-A=4. EXAMPLE n = 20: a[20] = 1111111111111111111155555555555555555555/15 = 74074074074074074077037037037037037037. MATHEMATICA f[x_] := 3*((100^x-1)/9) + 4*(10^x-1)/9 Table[f[w], {w, 1, 20}]/15 CROSSREFS Cf. A098210. Sequence in context: A361112 A210811 A107787 * A046191 A115616 A226256 Adjacent sequences: A099635 A099636 A099637 * A099639 A099640 A099641 KEYWORD nonn AUTHOR Labos Elemer, Oct 28 2004 STATUS approved

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Last modified February 23 03:03 EST 2024. Contains 370266 sequences. (Running on oeis4.)