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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

Table of n, a(n) for n=1..6.

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

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