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A185656 Final prime of first member of A019518 that is divisible by 7^n. 21
11, 601, 601, 601, 107839, 577937, 8341631, 8341631, 8341631, 8341631, 8341631, 166778433667 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

235711 is divisible by 7, and only at the concatenation through 601 is such a number divisible by 7^2.

CROSSREFS

Cf. A183194 and immediately following entries.

Sequence in context: A288326 A260583 A079915 * A142738 A262015 A275572

Adjacent sequences:  A185653 A185654 A185655 * A185657 A185658 A185659

KEYWORD

nonn,base

AUTHOR

James G. Merickel, Feb 01 2011

EXTENSIONS

a(12) added by James G. Merickel, Mar 29 2013

STATUS

approved

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Last modified September 21 00:17 EDT 2019. Contains 327252 sequences. (Running on oeis4.)