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A185656 Final prime in first term of A019518 that is divisible by 7^n. 21

%I #19 May 22 2022 02:14:54

%S 11,601,601,601,107839,577937,8341631,8341631,8341631,8341631,8341631,

%T 166778433637,4054944029077,58520914386689

%N Final prime in first term of A019518 that is divisible by 7^n.

%e None of the numbers 2, 23, 235, and 2357 are divisible by 11, but 235711 is divisible by 7, so a(1)=11.

%e Not until the concatenation through 601 is such a number divisible by 7^2, so a(2)=601.

%Y Cf. A183194 and immediately following entries.

%K nonn,base,more

%O 1,1

%A _James G. Merickel_, Feb 01 2011

%E a(12) added by _James G. Merickel_, Mar 29 2013

%E a(12) corrected and a(13)-a(14) added by _Seth A. Troisi_, May 18 2022

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Last modified April 20 00:58 EDT 2024. Contains 371798 sequences. (Running on oeis4.)