A328115 Numbers n from which zero or more applications of A003415 will lead to 5.

5, 6, 9, 14, 33, 49, 62, 94, 177, 445, 817, 886, 913, 961, 1146, 1155, 1633, 1719, 1822, 2006, 2173, 2209, 2306, 2625, 2649, 2825, 3255, 3430, 3450, 3871, 4018, 4405, 4414, 4575, 4638, 4869, 5294, 5687, 6009, 6162, 6506, 6849, 8110, 8113, 8126, 8334, 8570, 9741, 9770, 10222, 10635, 11221, 12014, 13377, 13458, 13767, 13993, 15351

Offset

1,1

Comments

Union of {5} with those terms of k of A099308 for which A327968(k) = 5.

Links

Antti Karttunen, Table of n, a(n) for n = 1..10000

Prog

(PARI)
A003415checked(n) = if(n<=1, 0, my(f=factor(n), s=0); for(i=1, #f~, if(f[i, 2]>=f[i, 1], return(0), s += f[i, 2]/f[i, 1])); (n*s));
isA328115(n) = { while((n>5), n = A003415checked(n)); (5==n); };
k=0; n=0; while(k<100, n++; if(isA328115(n), k++; print1(n, ", ")));

Crossrefs

Cf. A003415, A099308, A327968, A327975, A328117.

Sequence in context: A286338 A344231 A117951 * A327975 A227611 A124519

Adjacent sequences: A328112 A328113 A328114 * A328116 A328117 A328118

Keyword

nonn

Author

Antti Karttunen, Oct 07 2019

Status

approved