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f=lambda n,i=0,j=1:j>n and i-1or f(n,i+1,j+(`i`!=`i`[::-1]))
 
for i in [1,5,12]:
	print('%2s -> %s'%(i,f(i)))

Success #stdin #stdout 0.02s 9016KB

stdin

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Standard input is empty

stdout

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 1 -> 10
 5 -> 15
12 -> 23

https://ideone.com/pkfUJC

language:

Python (cpython 2.7.16)

created:

visibility:

public

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