This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A279774 #10 Dec 23 2016 21:42:49 %S A279774 2,11,20,29,38,56,65,83,101,110,128,155,200,254,263,281,290,308,326, %T A279774 335,353,380,425,506,515,533,551,560,578,605,650,758,776,785,803,830, %U A279774 875,1001,1010,1028,1055,1100,1253,1280,1325,1505,1550,1775 %N A279774 Numbers n such that the sum of digits of 4n equals 8. %C A279774 Inspired by A088406 = A063997/4 and A279769 (the analog for 9). %t A279774 Select[Range@ 2000, Total@ IntegerDigits[4 #] == 8 &] (* _Michael De Vlieger_, Dec 23 2016 *) %o A279774 (PARI) select( is(n)=sumdigits(4*n)==8, [1..1999]) %Y A279774 Cf. A007953 (digital sum), A279772 (sumdigits(2n) = 4), A279773 (sumdigits(3n) = 6), A279775 (sumdigits(5n) = 10), A279776 (sumdigits(6n) = 12), A279770 (sumdigits(7n) = 14), A279768 (sumdigits(8n) = 16), A279769 (sumdigits(9n) = 18), A279777 (sumdigits(9n) = 27). %Y A279774 Digital sum of m*n equals m: A088404 = A069537/2, A088405 = A052217/3, A088406 = A063997/4, A088407 = A069540/5, A088408 = A062768/6, A088409 = A063416/7, A088410 = A069543/8. %Y A279774 Cf. A005349 (Niven or Harshad numbers), A245062 (arranged in rows by digit sums). %Y A279774 Numbers with given digital sum: A011557 (1), A052216 (2), A052217 (3), A052218 (4), A052219 (5), A052220 (6), A052221 (7), A052222 (8), A052223 (9), A052224 (10), A166311 (11), A235151 (12), A143164 (13), A235225 (14), A235226 (15), A235227 (16), A166370 (17), A235228 (18), A166459 (19), A235229 (20). %K A279774 nonn,easy,base %O A279774 1,1 %A A279774 _M. F. Hasler_, Dec 23 2016