A064399 Numbers k whose sum of digits exceeds the sum of the digits of k^2.

39, 48, 49, 79, 149, 179, 249, 318, 348, 349, 389, 390, 399, 448, 449, 480, 489, 490, 498, 499, 548, 549, 579, 649, 679, 749, 789, 790, 795, 799, 849, 889, 895, 898, 899, 949, 1049, 1096, 1149, 1249, 1429, 1488, 1489, 1490, 1497, 1498, 1499, 1735, 1739

Offset: 1

Author

Robert G. Wilson v, Sep 28 2001

Keywords

• base
• nonn

Links

• Harry J. Smith, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A007953, A004159.

Programs

Mathematica

Select[ Range[ 2500 ], Apply[ Plus, IntegerDigits[ # ] ] > Apply[ Plus, IntegerDigits[ #^2 ] ] & ]

PARI

isok(n) = sumdigits(n) > sumdigits(n^2); \\ Michel Marcus, Jun 24 2018