Created
December 15, 2014 11:44
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euler14
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| # extra short | |
| M=k=L=0 | |
| while k<1e6: | |
| n=k=k+1;l=1 | |
| while n>1:n=[n/2,3*n+1][n%2];l+=1 | |
| if l>L:M,L=k,l | |
| print M | |
| # short and fast | |
| r={1:1};k=L=M=0 | |
| while k<1e6: | |
| n=k=k+1;l=0 | |
| while n not in r:n=[n/2,3*n+1][n%2];l+=1 | |
| r[k]=l=l+r[n] | |
| if l>L:M,L=k,l | |
| print M |
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