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A177999 Largest n digit prime with the most digits equal to 1. 2
7, 11, 911, 8111, 16111, 911111, 1171111, 71111111, 131111111, 1711111111, 31111111111, 311111111111, 5111111111111, 41111111111111, 111151111111111, 5111111111111111, 11111611111111111, 191111111111111111 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Select first for maximum number of 1's, then take the largest.

In more detail: To get a(n), look at the list of all the n-digit primes. Suppose k is the maximum number of 1's of any number on the list. Throw out any prime on the list that does not contain k 1's. Then a(n) = maximal number that is left on the list. - N. J. A. Sloane, Mar 20 2018

LINKS

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

CROSSREFS

Cf. A004022, A037055, A105992, A178000.

Sequence in context: A301736 A096952 A143602 * A293220 A126710 A300729

Adjacent sequences:  A177996 A177997 A177998 * A178000 A178001 A178002

KEYWORD

nonn,base

AUTHOR

Lekraj Beedassy, May 17 2010

STATUS

approved

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Last modified June 15 22:19 EDT 2019. Contains 324145 sequences. (Running on oeis4.)