999963domain: NAppears in sequences(Sum of digits of n)^6 - (sum of digits of n^6).at n=19A069980(Sum of digits of n)^6 - (sum of digits of n^6).at n=28A069980Numbers without comma-successors: these are the numbers k such that if the commas sequence A121805 is started at k instead of 1, there is no second term.at n=37A367341