A067511 - OEIS

%I #10 Sep 17 2024 19:07:39

%S 7,2401,117649,40353607,1977326743,9387480337647754305649,

%T 65712362363534280139543,459986536544739960976801,

%U 15286700631942576193765185769276826401,5243338316756303634461458718861951455543,12589255298531885026341962383987545444758743

%N Powers of 7 with digit sum divisible by 7.

%H Andrew Howroyd, <a href="/A067511/b067511.txt">Table of n, a(n) for n = 1..150</a>

%o (PARI) lista(n)={my(L=List(),k=0);while(#L<n, if(sumdigits(7^k)%7==0, listput(L,7^k)); k++); Vec(L)} \\ _Andrew Howroyd_, Sep 17 2024

%Y Intersection of A000420 and A273159.

%Y Cf. A067499, A067500, A067501, A067502, A067503, A067504, A067505, A067506, A067507, A067508, A067509, A067510.

%K base,easy,nonn

%O 1,1

%A _Amarnath Murthy_, Feb 11 2002

%E More terms from _Sascha Kurz_, Mar 18 2002

%E Offset changed and a(10) onwards from _Andrew Howroyd_, Sep 17 2024