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 A282764 9*n analog to Keith numbers. 2
 9, 17, 48, 55, 96, 120, 124, 131, 244, 426, 787, 1893, 5307, 5364, 5600, 10083, 31085, 46733, 52700, 53456, 56857, 56920, 109620, 110313, 110376, 374016, 2989245, 4081505, 5173765, 13017112, 17242512, 34346372, 34638676 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Like Keith numbers but starting from 9*n digits to reach n. Consider the digits of 9*n. Take their sum and repeat the process deleting the first addend and adding the previous sum. The sequence lists the numbers that after some iterations reach a sum equal to themselves. LINKS EXAMPLE 9*17 = 153: 1 + 5 + 3 = 9; 5 + 3 + 9 = 17. MAPLE with(numtheory): P:=proc(q, h, w) local a, b, k, n, t, v; v:=array(1..h); for n from 1 to q do a:=w*n; b:=ilog10(a)+1; if b>1 then for k from 1 to b do v[b-k+1]:=(a mod 10); a:=trunc(a/10); od; t:=b+1; v[t]:=add(v[k], k=1..b); while v[t]

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Last modified March 24 02:50 EDT 2023. Contains 361454 sequences. (Running on oeis4.)