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A061546 Harmonic mean of digits is 7. 0
7, 77, 777, 7777, 77777, 777777, 3999999, 4688999, 4689899, 4689989, 4689998, 4698899, 4698989, 4698998, 4699889, 4699898, 4699988, 4868999, 4869899, 4869989, 4869998, 4886999, 4888888, 4889699, 4889969, 4889996, 4896899 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..27.

EXAMPLE

6666999 is a term since 7/(1/6+1/6+1/6+1/6+1/9+1/9+1/9)=7.

MATHEMATICA

Do[ h = IntegerDigits[n]; If[ Sort[h][[1]] != 0 && Length[h]/Apply[Plus, 1/h] == 7, Print[n]], {n, 1, 10^6}]

CROSSREFS

Cf. A062179-A062185, A061383-A061388, A061423-A061425.

Sequence in context: A191465 A229281 A144071 * A002281 A097983 A261799

Adjacent sequences:  A061543 A061544 A061545 * A061547 A061548 A061549

KEYWORD

base,easy,nonn

AUTHOR

Vladeta Jovovic, Jun 13 2001

EXTENSIONS

More terms from Robert G. Wilson v, Aug 08 2001

STATUS

approved

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Last modified December 15 04:23 EST 2019. Contains 329991 sequences. (Running on oeis4.)