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A070279 Sum of digits of n equals the sum of digits of 2n. 1
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99, 108, 117, 126, 135, 153, 162, 171, 180, 189, 198, 207, 216, 225, 252, 261, 270, 279, 288, 297, 306, 315, 351, 360, 369, 378, 387, 396, 405, 450, 459, 468, 477, 486, 495, 504, 513, 522, 531, 540, 549, 594, 603, 612 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A010888(a(n)) = 9, but not all multiples of 9 belong to the sequence: e.g. 144=16*9: A007953(144)=1+4+4=9, but A007953(144*2)=A007953(288)=2+8+8=18. - Reinhard Zumkeller, May 15 2002

LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

MATHEMATICA

Select[Range[1000], Total[IntegerDigits[#]]==Total[IntegerDigits[ 2#]]&] (* Harvey P. Dale, Jul 22 2011 *)

PROG

(PARI) is(n)=sumdigits(n)==sumdigits(2*n) \\ Charles R Greathouse IV, Jun 17 2012

CROSSREFS

Sequence in context: A052484 A072830 A008591 * A016096 A070793 A052223

Adjacent sequences:  A070276 A070277 A070278 * A070280 A070281 A070282

KEYWORD

easy,nonn,base

AUTHOR

Benoit Cloitre, May 09 2002

EXTENSIONS

Incorrect comment removed by Charles R Greathouse IV, Jun 17 2012

STATUS

approved

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Last modified April 18 12:06 EDT 2014. Contains 240707 sequences.