The OEIS is supported by the many generous donors to the OEIS Foundation.

 Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A126973 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). 1
 1, 10, 13, 23, 1233, 33999999999999999 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS 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 CROSSREFS Cf. A001273, A053612. Sequence in context: A001273 A111524 A074346 * A220045 A101215 A102249 Adjacent sequences: A126970 A126971 A126972 * A126974 A126975 A126976 KEYWORD nonn,base AUTHOR Paolo P. Lava and Giorgio Balzarotti, Mar 20 2007; corrected Mar 23 2007 EXTENSIONS Next term is greater than 10^419753086419753. [From Charles R Greathouse IV, Nov 13 2010] STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 7 23:32 EST 2022. Contains 358671 sequences. (Running on oeis4.)