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A061385 Numbers n such that sum of digits = twice number of digits. 7

%I #14 Mar 17 2023 11:11:06

%S 2,13,22,31,40,105,114,123,132,141,150,204,213,222,231,240,303,312,

%T 321,330,402,411,420,501,510,600,1007,1016,1025,1034,1043,1052,1061,

%U 1070,1106,1115,1124,1133,1142,1151,1160,1205,1214,1223,1232,1241,1250,1304

%N Numbers n such that sum of digits = twice number of digits.

%H Robert Israel, <a href="/A061385/b061385.txt">Table of n, a(n) for n = 1..10000</a>

%e 141 is a term as the arithmetic mean of the digits is (1+4+1)/3 = 2.

%p S:= proc(d,k,flag) option remember;

%p if d = 1 then

%p if k >= 0 and k <= 9 then return [k]

%p else return []

%p fi

%p fi;

%p [seq(op(map(`+`, procname(d-1,k-i,0), i*10^(d-1))),i=flag..min(k,9))]

%p end proc:

%p seq(op(S(d,2*d,1)),d=1..5); # _Robert Israel_, Apr 23 2017

%o (Magma) [ n: n in [1..1310] | &+Intseq(n) eq 2*#Intseq(n) ]; // _Bruno Berselli_, Jun 30 2011

%Y Cf. A061383, A061384, A061386, A061387, A061388, A061423, A061424, A061425.

%K nonn,base,easy

%O 1,1

%A _Amarnath Murthy_, May 03 2001

%E More terms from Larry Reeves (larryr(AT)acm.org), May 16 2001

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Last modified March 29 08:53 EDT 2024. Contains 371268 sequences. (Running on oeis4.)