A046428 Numbers requiring 8 steps to reach a prime under the prime factor concatenation procedure.

78, 170, 315, 316, 544, 553, 579, 594, 626, 675, 726, 909, 940, 1056, 1088, 1090, 1107, 1118, 1178, 1210, 1260, 1349, 1382, 1482, 1580, 1585, 1616, 1617, 1620, 1645, 1647, 1746, 1824, 1872, 2033, 2145, 2188, 2195, 2201, 2211, 2225, 2250, 2338, 2349, 2365, 2378

Offset: 1

Author

Patrick De Geest, Jun 15 1998

Keywords

• nonn
• base

Links

• Rémy Sigrist, Table of n, a(n) for n = 1..1000
• P. De Geest, Home Primes
• Rémy Sigrist, PARI program for A046428

Crossrefs

Cf. A037271, A046411.

Programs

PARI

\\ See Links section.

Extensions

More terms from Rémy Sigrist, May 19 2019