A246647 - OEIS

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A246647

Starting numbers k = a(n) for the (modified) Collatz map iteration which survive in the sieved Collatz table of A246646.

2, 3, 6, 7, 9, 12, 15, 16, 18, 19, 21, 24, 25, 27, 28, 30, 33, 34, 36, 37, 39, 42, 43, 45, 48, 51, 52, 54, 55, 57, 60, 63, 64, 66, 69, 70, 72, 73, 75, 78, 79, 81, 82, 84, 87, 88, 90, 93, 96, 97, 99, 100, 102, 105, 106, 108, 109, 111, 114, 115

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

The (modified or Terras) Collatz map is T(k) = (3*k+1)/2 if k is odd and T(k) = k/2 if k is even, where k is a positive integer.

1 is not listed because it appears in row n=1 for k=2 of A246646 . 4 does not appear because 4 = A246646(2,4). Similarly 5 = A246646(2,2), 8 = A246646(2,3), 10 = A246646(4,7), 11 = A246646(4,2), 13 = A246646(4,5), 14 = A246646(5,2), etc.

LINKS

Table of n, a(n) for n=1..60.

CROSSREFS

Cf. A246646.

Sequence in context: A346301 A341257 A153348 * A177729 A049993 A167793

Adjacent sequences: A246644 A246645 A246646 * A246648 A246649 A246650

KEYWORD

nonn,easy

AUTHOR

Wolfdieter Lang, Oct 02 2014

STATUS

approved