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 A279772 Numbers n such that the sum of digits of 2n equals 4. 8
 2, 11, 20, 56, 65, 101, 110, 155, 200, 506, 515, 551, 560, 605, 650, 1001, 1010, 1055, 1100, 1505, 1550, 2000, 5006, 5015, 5051, 5060, 5105, 5150, 5501, 5510, 5555, 5600, 6005, 6050, 6500, 10001, 10010, 10055, 10100, 10505, 10550, 11000, 15005, 15050, 15500 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Inspired by A088404 = A069537/2 and A279769 (the analog for 9). LINKS MATHEMATICA Select[Range@ 15500, Total@ IntegerDigits[2 #] == 4 &] (* Michael De Vlieger, Dec 23 2016 *) PROG (PARI) select( is(n)=sumdigits(2*n)==4, [1..9999]) CROSSREFS Cf. A007953 (digital sum), A052216 (sumdigits(n) = 2), A279773 (sumdigits(3n) = 6), A279774 (sumdigits(4n) = 8), A279775 (sumdigits(5n) = 10), A279776 (sumdigits(6n) = 12), A279770 (sumdigits(7n) = 14), A279768 (sumdigits(8n) = 16), A279769 (sumdigits(9n) = 18), A279777 (sumdigits(9n) = 27). 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. Cf. A005349 (Niven or Harshad numbers), A245062 (arranged in rows by digit sums). 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). Sequence in context: A092595 A175927 A116990 * A226416 A146087 A064975 Adjacent sequences:  A279769 A279770 A279771 * A279773 A279774 A279775 KEYWORD nonn,easy,base AUTHOR M. F. Hasler, Dec 23 2016 STATUS approved

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Last modified April 19 09:11 EDT 2019. Contains 322241 sequences. (Running on oeis4.)