A179122 a(1) = 8, a(n) = concatenation of the prime divisors, ordered descending by their size, of a(n - 1)

8, 222, 3732, 311322, 89531132, 2238278322, 123077433732, 124155175111322, 26516317994713012, 1712365225813871322, 28539420430231188732, 2378285035852599061322, 14894019245254379840272

Offset

1,1

Links

Table of n, a(n) for n=1..13.

Markus Tervooren, Factorizations of inverse home prime base 10 8

Example

a(1) = 8 = 2 . 2 . 2, so a(2) = 222. 222 = 37 . 3 . 2, so a(3) = 3732.

Mathematica

nxt[n_]:=FromDigits[Flatten[IntegerDigits/@Reverse[Table[#[[1]], {#[[2]]}]&/@ FactorInteger[n]]]]; NestList[nxt, 8, 15] (* Harvey P. Dale, Feb 04 2015 *)

Crossrefs

Cf. A037274.

Sequence in context: A316954 A299734 A006919 * A300349 A300434 A300768

Adjacent sequences: A179119 A179120 A179121 * A179123 A179124 A179125

Keyword

nonn,base

Author

Ivan Panchenko, Jun 30 2010

Status

approved