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

 

Logo

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A275532 Possible values for sum of numbers in Collatz trajectory (A033493), sorted into ascending order. 1
1, 3, 7, 15, 31, 36, 46, 49, 55, 63, 66, 67, 91, 106, 119, 127, 139, 145, 148, 186, 190, 197, 214, 235, 248, 255, 259, 274, 281, 288, 301, 302, 316, 325, 330, 339, 346, 357, 386, 393, 399, 413, 427, 442, 452, 465, 497, 498, 500, 505, 509, 511, 519, 535, 540, 557 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Values a(n) such that a(n) = A033493(x) = A033493(y)  for distinct numbers x and y: 442, 609, 633, 724, 904, 925, ...

LINKS

Table of n, a(n) for n=1..56.

MATHEMATICA

Take[#, 56] &@ Union@ Table[Total@ FixedPointList[Which[# == 1, 1, OddQ@ #, 3 # + 1, True, #/2] &, n] - 1, {n, 10^3}] (* Michael De Vlieger, Aug 02 2016 *)

PROG

(MAGMA) Set(Sort([&+[k eq 1 select n else IsOdd(Self(k-1)) and not IsOne(Self(k-1)) select 3*Self(k-1)+1 else Self(k-1) div 2: k in [1..5*n]]: n in [1..2^10] | &+[k eq 1 select n else IsOdd(Self(k-1)) and not IsOne(Self(k-1)) select 3*Self(k-1)+1 else Self(k-1) div 2: k in [1..5*n]] le 2^10]))

CROSSREFS

Cf. A033493, A275531.

Sequence in context: A320024 A098583 A275531 * A212315 A043729 A331503

Adjacent sequences:  A275529 A275530 A275531 * A275533 A275534 A275535

KEYWORD

nonn

AUTHOR

Jaroslav Krizek, Jul 31 2016

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 18 19:59 EST 2021. Contains 340262 sequences. (Running on oeis4.)