

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
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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.


KEYWORD

nonn,base,more


AUTHOR



EXTENSIONS



STATUS

approved



