%I #16 Aug 12 2024 13:15:30
%S 78,170,315,316,544,553,579,594,626,675,726,909,940,1056,1088,1090,
%T 1107,1118,1178,1210,1260,1349,1382,1482,1580,1585,1616,1617,1620,
%U 1645,1647,1746,1824,1872,2033,2145,2188,2195,2201,2211,2225,2250,2338,2349,2365,2378
%N Numbers requiring 8 steps to reach a prime under the prime factor concatenation procedure.
%H Rémy Sigrist, <a href="/A046428/b046428.txt">Table of n, a(n) for n = 1..1000</a>
%H P. De Geest, <a href="https://www.worldofnumbers.com/topic1.htm">Home Primes</a>
%H Rémy Sigrist, <a href="/A046428/a046428.gp.txt">PARI program for A046428</a>
%o (PARI) \\ See Links section.
%Y Cf. A037271, A046411.
%K nonn,base
%O 1,1
%A _Patrick De Geest_, Jun 15 1998
%E More terms from _Rémy Sigrist_, May 19 2019