A036920 - OEIS

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A036920

Composite numbers n such that digit sum of n equals digit sum of sum of its prime factors (counted with multiplicity).

4, 22, 27, 94, 105, 114, 121, 150, 166, 202, 204, 222, 224, 265, 274, 315, 342, 346, 355, 382, 438, 445, 450, 454, 517, 526, 540, 562, 612, 634, 640, 706, 841, 852, 913, 915, 922, 1068, 1086, 1111, 1120, 1122, 1138, 1165, 1185, 1200, 1219, 1221, 1230

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..49.

MATHEMATICA

ds[n_]:=Total[IntegerDigits[n]]; t={}; Do[If[!PrimeQ[n]&&ds[n]==ds[Total[ Times@@@FactorInteger[n]]], AppendTo[t, n]], {n, 4, 1230}]; t (* Jayanta Basu, Jun 04 2013 *)

CROSSREFS

Cf. A006753, A036921, A019506.

Sequence in context: A006753 A098836 A204341 * A036921 A083510 A277586

Adjacent sequences: A036917 A036918 A036919 * A036921 A036922 A036923

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Jan 04 1999

EXTENSIONS

Title made more precise by Sean A. Irvine, Nov 30 2020

STATUS

approved