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A185656 Final prime in first term of A019518 that is divisible by 7^n. 21
11, 601, 601, 601, 107839, 577937, 8341631, 8341631, 8341631, 8341631, 8341631, 166778433637, 4054944029077, 58520914386689 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
None of the numbers 2, 23, 235, and 2357 are divisible by 11, but 235711 is divisible by 7, so a(1)=11.
Not until the concatenation through 601 is such a number divisible by 7^2, so a(2)=601.
CROSSREFS
Cf. A183194 and immediately following entries.
Sequence in context: A288326 A260583 A079915 * A142738 A262015 A275572
KEYWORD
nonn,base,more
AUTHOR
James G. Merickel, Feb 01 2011
EXTENSIONS
a(12) added by James G. Merickel, Mar 29 2013
a(12) corrected and a(13)-a(14) added by Seth A. Troisi, May 18 2022
STATUS
approved

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Last modified February 24 13:52 EST 2024. Contains 370303 sequences. (Running on oeis4.)