A341235 a(n) is the greatest term in n-th row of A341231.

1, 2, 4, 4, 14, 6, 8, 8, 28, 14, 28, 12, 28, 14, 16, 16, 62, 28, 52, 20, 62, 28, 56, 24, 62, 28, 44, 28, 52, 30, 32, 32, 122, 62, 100, 36, 110, 52, 104, 40, 122, 62, 124, 44, 118, 56, 112, 48, 122, 62, 84, 52, 112, 54, 88, 56, 110, 58, 76, 60, 100, 62, 64, 64

Offset

1,2

Comments

Records of a(n)/n appear to happen for n in A083318.

Links

Rémy Sigrist, Table of n, a(n) for n = 1..10000

Index entries for sequences related to 3x+1 (or Collatz) problem

Formula

a(n) >= n, equality implies that n equals 1 or is even.

a(n) < 4*n.

Example

For n = 10:
- the trajectory of 10 under A245471 is 10 -> 5 -> 14 -> 7 -> 8 -> 4 -> 2 -> 1,
- so a(10) = 14.

Prog

(PARI) a(n) = { my (m=n); while (n>1, m=max(m, n=if (n%2, bitxor(n, 2*n+1), n/2))); m }

Crossrefs

Cf. A025586, A083318, A245471, A340873, A341231.

Sequence in context: A290437 A154987 A089419 * A363649 A263023 A193848

Adjacent sequences: A341232 A341233 A341234 * A341236 A341237 A341238

Keyword

nonn,look,base

Author

Rémy Sigrist, Feb 07 2021

Status

approved