The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A213909 Sum of all even numbers in Collatz (3x+1) trajectory of n. 8
 0, 2, 40, 6, 30, 46, 234, 14, 276, 40, 212, 58, 100, 248, 562, 30, 178, 294, 424, 60, 126, 234, 516, 82, 538, 126, 81178, 276, 366, 592, 80910, 62, 688, 212, 446, 330, 444, 462, 1894, 100, 81096, 168, 1090, 278, 416, 562, 80816, 130, 666, 588, 926, 178, 340 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS T. D. Noe, Table of n, a(n) for n = 1..10000 EXAMPLE a(5)=30 since Collatz trajectory of 5 is 5,16,8,4,2,1. MATHEMATICA Collatz[n_] := NestWhileList[If[EvenQ[#], #/2, 3 # + 1] &, n, # > 1 &]; Table[Total[Select[Collatz[n], EvenQ]], {n, 100}] (* T. D. Noe, Mar 05 2013 *) CROSSREFS Cf. A033493. Sequence in context: A232086 A356683 A047660 * A349717 A349726 A275547 Adjacent sequences: A213906 A213907 A213908 * A213910 A213911 A213912 KEYWORD nonn AUTHOR Jayanta Basu, Mar 05 2013 STATUS approved

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

Last modified February 29 13:45 EST 2024. Contains 370425 sequences. (Running on oeis4.)