

A215736


a(n) is the first digit to appear n times in succession in a power of 7.


12



1, 1, 7, 9, 5, 7, 3, 1, 0, 0, 3, 4, 6, 5, 9
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,3


LINKS

Table of n, a(n) for n=1..15.


MATHEMATICA

n = 1; x = 1; lst = {};
For[i = 1, i <= 10000, i++,
z = Split[IntegerDigits[x]]; a = Length /@ z; b = Max[a];
For[j = n, j <= b, j++,
AppendTo[lst, First[First[Part[z, First[Position[a, b]]]]]]; n++
]; x = 7 x ]; lst (* Robert Price, Mar 16 2019 *)


CROSSREFS

Cf. A215730, A045875, A215732.
Sequence in context: A093206 A070693 A198417 * A132715 A154910 A063603
Adjacent sequences: A215733 A215734 A215735 * A215737 A215738 A215739


KEYWORD

nonn,base,more


AUTHOR

V. Raman, Aug 22 2012


EXTENSIONS

a(10) added by V. Raman, Nov 23 2013
a(11)a(13) from Giovanni Resta, Apr 19 2016
a(14)a(15) from Bert Dobbelaere, Feb 15 2019


STATUS

approved



