1,3

a(n) = 0 iff A139436(n) = 0; a(n) > 0 for n > 4;

a(n) <= A004523(n); a(A008585(n)) = A005843(n).

R. Zumkeller, Table of n, a(n) for n = 1..10000

Eric Weisstein's World of Mathematics, Collatz Problem

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

a(30) = 20: 30 = 20+10;

a(31) = 16: 31 = 16+8+4+2+1;

a(32) = 4: 32 = 4+2+1+4+2+1+4+2+1+4+2+1+4;

a(33) = 22: 33 = 22+11;

a(34) = 4: 34 = 4+2+1+4+2+1+4+2+1+4+2+1+4+2;

a(35) = 20: 35 = 20+10+5.

Cf. A006370.

Sequence in context: A264583 A158984 A158417 * A077909 A247126 A327117

Adjacent sequences: A139432 A139433 A139434 * A139436 A139437 A139438

nonn

Reinhard Zumkeller, Apr 21 2008

approved