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Search: id:A123872
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| A123872 |
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Start with the seed a(0)=2. The minimum number, different from 1, that multiplied by 2 (seed) produces a number with 2 as its rightmost digit is a(1)=6. Then 6*2=12. Again, the minimum number that multiplied by 12 produces 12 as its rightmost digits is a(2)=26 (12*26=312). And so on. |
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+0
4
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OFFSET
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0,1
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EXAMPLE
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a(0)=2
a(1)=6 because 2*6 = 12
a(2)=26 because 12*26 = 312
a(3)=126 because 312*126 = 39312
a(4)=6251 because 39312*6251 = 245739312
a(5)=62500001 because 245739312*62500001 = 15358707245739312
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MAPLE
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P:=proc(n) local i, j, k; k:=0; j:=n; while j>0 do j:=trunc(j/10); k:=k+1; od; for i from 2 by 1 to n^2 do j:=((n*(i-1)) mod (10^k)); if j=0 then print(i, n*i); break; fi; od; end: P(312);
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CROSSREFS
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Adjacent sequences: A123869 A123870 A123871 this_sequence A123873 A123874 A123875
Sequence in context: A114710 A092880 A034474 this_sequence A030937 A030827 A030947
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KEYWORD
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nonn
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AUTHOR
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Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), Oct 16 2006
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