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 A282693 Numbers n such that n = (sum of digits of n)*((sum of digits of n) + 1). 0
 0, 12, 42, 90, 156 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS EXAMPLE 0=0*(0+1). 12=(1+2)*(1+2+1). 42=(4+2)*(4+2+1). 90=(9+0)*(9+0+1). 156=(1+5+6)*(1+5+6+1) MATHEMATICA fQ[n_] := Block[{a = Plus @@ IntegerDigits@ n}, a*(a +1) == n]; Select[ Range[0, 1000], fQ] (* Robert G. Wilson v, Feb 24 2017 *) PROG (VBA) Sub calcul() Sheets("Result").Select Range("A1").Select For i = 1 To 10000000 Sum = 0 For k = 1 To Len(i) Sum = Sum + Mid(i, k, 1) Next res = Sum * (Sum + 1) If res = i Then ActiveCell.Value = i ActiveCell.Offset(1, 0).Select End If Next End Sub CROSSREFS Sequence in context: A241854 A085798 A270700 * A045945 A210206 A005901 Adjacent sequences:  A282690 A282691 A282692 * A282694 A282695 A282696 KEYWORD bref,base,fini,full,nonn AUTHOR Shmelev Aleksei, Feb 24 2017 STATUS approved

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Last modified August 16 23:58 EDT 2018. Contains 313809 sequences. (Running on oeis4.)