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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 Table of n, a(n) for n=1..45. 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: A175927 A116990 A327264 * 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 August 9 04:25 EDT 2024. Contains 375027 sequences. (Running on oeis4.)