A336994 Entries of A336938 without duplicates.

0, 4, 16, 52, 160, 9232, 13120, 39364, 41524, 250504, 1276936, 6810136, 8153620, 27114424, 50143264, 106358020, 121012864, 593279152, 1570824736, 2482111348, 2798323360, 17202377752

Offset: 1

Author

Markus Sigg, Aug 10 2020

Keywords

• nonn
• more

Comments

Is this (apart from the first 2 entries) the same as A006885? - R. J. Mathar, Aug 16 2020

Crossrefs

Cf. A336938.

Programs

PARI

firstMiss(A) = { my(i); if(#A == 0 || A[1] > 0, return(0)); for(i = 1, A[#A] + 1, if(!setsearch(A, i), return(i))); };
iter(A) = { my(a = firstMiss(A)); while(!setsearch(A, a), A = setunion(A, Set([a])); a = if(a % 2, 3*a+1, a/2)); A; };
makeVec(m) = { my(v = [], A = Set([0]), i); for(i = 1, m, if (length(v) == 0 || v[length(v)] != A[#A], v = concat(v, A[#A])); if (i < m, A = iter(A))); v; };
makeVec(10000)

Extensions

a(16)-a(22) from Jinyuan Wang, Aug 13 2020