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A099666 a[n] is the largest prime before A002280[n] repdigits. 0
5, 61, 661, 6661, 66653, 666649, 6666617, 66666653, 666666653, 6666666661, 66666666643, 666666666619, 6666666666629, 66666666666647, 666666666666647, 6666666666666571, 66666666666666601, 666666666666666661 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..18.

EXAMPLE

n=2: 61 is before 66.

MATHEMATICA

<<NumberTheory`NumberTheoryFunctions` Table[PreviousPrime[6*(10^n-1)/9], {n, 1, 35}]

CROSSREFS

Cf. A003618, A003617, A096497, A096498, A068104, A002275-A002283, A099656-A099668.

Sequence in context: A000363 A200956 A203358 * A189444 A217811 A217280

Adjacent sequences:  A099663 A099664 A099665 * A099667 A099668 A099669

KEYWORD

base,nonn

AUTHOR

Labos Elemer, Nov 17 2004

STATUS

approved

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Last modified April 9 14:04 EDT 2020. Contains 333353 sequences. (Running on oeis4.)