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

11, 601, 601, 601, 107839, 577937, 8341631, 8341631, 8341631, 8341631, 8341631, 166778433637, 4054944029077, 58520914386689

Offset

1,1

Links

Table of n, a(n) for n=1..14.

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

Adjacent sequences: A185653 A185654 A185655 * A185657 A185658 A185659

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