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A178004 The n-digit prime with the largest number of 6's, the largest of these if there is more than 1. 0 if no such prime exists. 0
0, 67, 661, 6661, 96667, 666667, 9666661, 66666667, 666666667, 6666666661, 66666666667, 669666666661, 6666676666667, 96666666666667, 696666666666661, 6966666666666661, 96666666666666661, 666666666666666661 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

EXAMPLE

The largest number of 6's in 5-digit primes is 3, achieved by 16661, 26669, 46663, 56663, 60661,..., 76667, 96661, 96667. a(5) is the largest of these, 96667. [R. J. Mathar, Nov 23 2010]

CROSSREFS

Cf. A037065, A105978, A099660

Sequence in context: A245878 A289867 A142139 * A106106 A093942 A166802

Adjacent sequences:  A178001 A178002 A178003 * A178005 A178006 A178007

KEYWORD

nonn,base

AUTHOR

Lekraj Beedassy, May 17 2010

STATUS

approved

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Last modified August 7 23:50 EDT 2022. Contains 355995 sequences. (Running on oeis4.)