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A046428 Numbers requiring 8 steps to reach a prime under the prime factor concatenation procedure. 1
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Rémy Sigrist, Table of n, a(n) for n = 1..1000

P. De Geest, Home Primes

Rémy Sigrist, PARI program for A046428

PROG

(PARI) See Links section.

CROSSREFS

Cf. A037271, A046411.

Sequence in context: A042945 A044329 A044710 * A119146 A044410 A044791

Adjacent sequences:  A046425 A046426 A046427 * A046429 A046430 A046431

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Jun 15 1998

EXTENSIONS

More terms from Rémy Sigrist, May 19 2019

STATUS

approved

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Last modified July 29 15:22 EDT 2021. Contains 346346 sequences. (Running on oeis4.)