

A275531


Values taken by the 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, 442, 452, 465, 497, 498, 500, 505, 509, 511, 519, 535, 540
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OFFSET

1,2


COMMENTS

Values a(n) such that a(n) = a(n+1): 442, 609, 633, 724, 904, 925, ...


LINKS

Table of n, a(n) for n=1..56.
Eric Weisstein's World of Mathematics, Collatz Problem
Wikipedia, Collatz conjecture


PROG

(MAGMA) Sort([&+[k eq 1 select n else IsOdd(Self(k1)) and not IsOne(Self(k1)) select 3*Self(k1)+1 else Self(k1) div 2: k in [1..5*n]]: n in [1..2^10]  &+[k eq 1 select n else IsOdd(Self(k1)) and not IsOne(Self(k1)) select 3*Self(k1)+1 else Self(k1) div 2: k in [1..5*n]] le 2^10])


CROSSREFS

Cf. A033493, A275532.
Sequence in context: A090633 A320024 A098583 * A275532 A212315 A043729
Adjacent sequences: A275528 A275529 A275530 * A275532 A275533 A275534


KEYWORD

nonn


AUTHOR

Jaroslav Krizek, Jul 31 2016


STATUS

approved



