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A036924 Digit sum of composite even number equals digit sum of juxtaposition of its prime factors (counted with multiplicity). 1
4, 22, 58, 94, 166, 202, 274, 346, 378, 382, 438, 454, 526, 562, 576, 588, 634, 636, 648, 654, 666, 690, 706, 728, 762, 778, 852, 922, 958, 1086, 1282, 1284, 1376, 1626, 1642, 1678, 1736, 1776, 1822, 1842, 1858, 1872, 1894, 1908, 1952, 1962, 1966, 2038 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..48.

MATHEMATICA

d[n_] := IntegerDigits[n]; co[n_, k_] := Nest[Flatten[d[{#, n}]]&, n, k-1]; t={}; Do[If[!PrimeQ[n] && Total[d[n]] == Total[Flatten[d[co@@@FactorInteger[n]]]], AppendTo[t, n]], {n, 4, 2040, 2}]; t (* Jayanta Basu, Jun 04 2013 *)

CROSSREFS

Cf. A006753, A019506, A036925.

Sequence in context: A089761 A098837 A104171 * A130015 A189953 A174814

Adjacent sequences:  A036921 A036922 A036923 * A036925 A036926 A036927

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Jan 04 1999

EXTENSIONS

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

STATUS

approved

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Last modified October 20 03:04 EDT 2021. Contains 348099 sequences. (Running on oeis4.)