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A052221 Numbers whose sum of digits is 7. 34
7, 16, 25, 34, 43, 52, 61, 70, 106, 115, 124, 133, 142, 151, 160, 205, 214, 223, 232, 241, 250, 304, 313, 322, 331, 340, 403, 412, 421, 430, 502, 511, 520, 601, 610, 700, 1006, 1015, 1024, 1033, 1042, 1051, 1060, 1105, 1114, 1123, 1132, 1141, 1150, 1204 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A007953(a(n)) = 7; number of repdigits = #{7,1111111} = A242627(7) = 2. - Reinhard Zumkeller, Jul 17 2014

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

MATHEMATICA

Select[Range[1500], Total[IntegerDigits[#]]==7&] (* Harvey P. Dale, Apr 11 2012 *)

PROG

(MAGMA) [n: n in [1..1500] | &+Intseq(n) eq 7 ]; // Vincenzo Librandi, Mar 08 2013

(Haskell)

a052221 n = a052221_list !! (n-1)

a052221_list = filter ((== 7) . a007953) [0..]

-- Reinhard Zumkeller, Jul 17 2014

CROSSREFS

Cf. A007953.

Cf. A011557 (1), A052216 (2), A052217 (3), A052218 (4), A052219 (5), A052220 (6), 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).

A242614, A242627.

Sequence in context: A043481 A217009 A017245 * A119461 A028560 A190530

Adjacent sequences:  A052218 A052219 A052220 * A052222 A052223 A052224

KEYWORD

nonn,base,easy

AUTHOR

Henry Bottomley, Feb 01 2000

EXTENSIONS

Offset changed from Bruno Berselli, Mar 07 2013

STATUS

approved

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Last modified February 22 11:30 EST 2018. Contains 299452 sequences. (Running on oeis4.)