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 A055016 Smallest number whose sum of squares of digits is n. 4
 0, 1, 11, 111, 2, 12, 112, 1112, 22, 3, 13, 113, 222, 23, 123, 1123, 4, 14, 33, 133, 24, 124, 233, 1233, 224, 5, 15, 115, 1115, 25, 125, 1125, 44, 144, 35, 135, 6, 16, 116, 1116, 26, 45, 145, 335, 226, 36, 136, 1136, 444, 7, 17, 117, 46, 27, 127, 1127, 246 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Zak Seidov, Table of n, a(n) for n = 0..600 E. Angelini, Sum of squares -- and a concatenation, SeqFan list, June 23, 2015. PROG (PARI) A055016(n, q=9, m)={ n>1||return(n); forstep(q=min(sqrtint(n), q), 1, -1, m && n \ q^2 * #Str(q) > #Str(m) && break; t=eval(Str(A055016(n-q^2, q), q)); (!m || t

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Last modified October 14 12:02 EDT 2019. Contains 328004 sequences. (Running on oeis4.)