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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
 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 CROSSREFS Cf. A246646. Sequence in context: A029515 A061951 A153348 * A177729 A049993 A167793 Adjacent sequences:  A246644 A246645 A246646 * A246648 A246649 A246650 KEYWORD nonn,easy AUTHOR Wolfdieter Lang, Oct 02 2014 STATUS approved

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Last modified July 24 04:08 EDT 2019. Contains 325290 sequences. (Running on oeis4.)