The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A143993 Composite numbers n such that the sum of prime factors of n (counted with multiplicity) terminates n as a substring. 1
 4, 18, 220, 230, 246, 366, 444, 624, 1166, 1323, 1462, 1530, 1992, 2230, 2406, 2625, 2730, 3024, 3125, 3182, 3286, 3484, 3606, 3760, 4220, 5733, 6372, 6435, 7592, 8658, 8856, 9585, 9747, 10143, 10850, 11232, 11655, 13176, 13230, 13275, 13760, 14792 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Equals A071173 without its first term. [From R. J. Mathar, Sep 13 2008] LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 EXAMPLE a(9)=1166=2*11*53 and 2+11+53=66 and 1166 ends in 66. MATHEMATICA nssQ[n_]:=Module[{idn=IntegerDigits[n], ss=IntegerDigits[Total[ Flatten[ Table[#[[1]], {#[[2]]}]&/@FactorInteger[n]]]]}, Take[idn, -Length[ss]]==ss]; Select[Range[2, 15000], !PrimeQ[#]&&nssQ[#]&] (* Harvey P. Dale, Sep 03 2012 *) CROSSREFS Sequence in context: A327335 A275965 A071173 * A145660 A246531 A278565 Adjacent sequences:  A143990 A143991 A143992 * A143994 A143995 A143996 KEYWORD base,nonn AUTHOR Gil Broussard, Sep 07 2008 EXTENSIONS Definition clarified by N. J. A. Sloane, Sep 03 2012 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 20 04:43 EDT 2021. Contains 345157 sequences. (Running on oeis4.)