Smallest number of additive persistence 5 is 1 followed by 2222222222222222222222 9's.pic.twitter.com/QcuBmsStYY
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Smallest number of additive persistence 5 is 1 followed by 2222222222222222222222 9's.pic.twitter.com/QcuBmsStYY
not add the digits, but take the sum
I found the smallest number in base 10 of additive persistence 5 but this tweet is too small to contain it. #fermat
Similarly, one can take the English alphabet and by, substituting every vowel with a prime number and letters with sibilant sounds with punctuation marks, derive the names of the first five presidents of the United States. It’s harder than it sounds.
That's brilliant if it works. I gotta check it later
This changes the additive persistence: When adding up digits, ignore the number 9 as it acts like a chameleon next to any other digit. If all digits are 9 then the sum total will be 9.
Hmm... When I add these up, I'm getting 212, which would reduce to 5 in the next step, making a total of 3 iterations. What am I missing? It seems like a 1 followed by 13 9's would be the smallest with 4 iterations.
The sum is 199 then 19 then 10 then 1
Very cool. What is the smallest number with an additive persistence of 5? Is there an upper limit to additive persistence?
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