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Consider a function which, for a given whole number n,
returns the number of ones required when writing out all
numbers between 0 and n. For example, f(13)=6. Notice that
f(1)=1. What is the next largest n such that f(n)=n?

Question Posted / deb biswas

Answers were Sorted based on User's Feedback



Consider a function which, for a given whole number n, returns the number of ones required when wri..

Answer / blahblahblah

#1: N = 1, f(N) = 1
#2: N = 199981, f(N) = 199981
#3: N = 199982, f(N) = 199982
#4: N = 199983, f(N) = 199983
#5: N = 199984, f(N) = 199984
#6: N = 199985, f(N) = 199985
#7: N = 199986, f(N) = 199986
#8: N = 199987, f(N) = 199987
#9: N = 199988, f(N) = 199988
#10: N = 199989, f(N) = 199989
#11: N = 199990, f(N) = 199990
#12: N = 200000, f(N) = 200000
#13: N = 200001, f(N) = 200001
#14: N = 1599981, f(N) = 1599981
#15: N = 1599982, f(N) = 1599982

Is This Answer Correct ?    7 Yes 0 No

Consider a function which, for a given whole number n, returns the number of ones required when wri..

Answer / sk

Next Largest NO such that f(n) = n is
199981

Is This Answer Correct ?    4 Yes 0 No

Consider a function which, for a given whole number n, returns the number of ones required when wri..

Answer / tihor

its is 1599990

Is This Answer Correct ?    1 Yes 5 No

Consider a function which, for a given whole number n, returns the number of ones required when wri..

Answer / suman

f(2) = 1
f(20)= 12
f(200) = 140
f(2000) = 1600
f(20000) = 18000
f(200000) = 200000

200,000 is the answere

Is This Answer Correct ?    0 Yes 6 No

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