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A126973
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a(n+1) is the smallest integer greater than a(n) such that the sum of the squares of its decimal digits is equal to a(n).
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1
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OFFSET
| 1,2
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EXAMPLE
| 10 --> 1^2+0^2 = 1+0 =1
13 --> 1^2+3^2 = 1+9 = 10
23 --> 2^2+3^2 = 4+9 =13
1233 --> 1^2+2^2+3^3+3^2 = 1+4+9+9 = 23
33999999999999999 = 3^2*2 + 9^2*15 = 1233
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CROSSREFS
| Cf. A001273, A053612.
Sequence in context: A001273 A111524 A074346 * A101215 A102249 A195313
Adjacent sequences: A126970 A126971 A126972 * A126974 A126975 A126976
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KEYWORD
| nonn,base
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AUTHOR
| Paolo P. Lava & Giorgio Balzarotti (paoloplava(AT)gmail.com), Mar 20 2007; corrected Mar 23 2007
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EXTENSIONS
| Next term is greater than 10^419753086419753. [From Charles R Greathouse IV, Nov 13 2010]
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