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

1,2

Comments

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

Links

Table of n, a(n) for n=1..22.

Prog

(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)

Crossrefs

Cf. A336938.

Sequence in context: A197132 A266943 A100774 * A107767 A319775 A220936

Adjacent sequences: A336991 A336992 A336993 * A336995 A336996 A336997

Keyword

nonn,more

Author

Markus Sigg, Aug 10 2020

Extensions

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

Status

approved