A104355 Number of trailing zeros in decimal representation of A104350(n).

0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6

Offset

1,10

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

David A. Corneth, PARI link

Reinhard Zumkeller, Products of largest prime factors of numbers <= n.

Formula

a(A104356(n)) = n and a(m) < n for m < A104356(n);

a(n) = A122840(A104350(n)). - Reinhard Zumkeller, Mar 10 2013

Mathematica

IntegerExponent[FoldList[Times, Array[FactorInteger[#][[-1, 1]] &, 100]], 10] (* Amiram Eldar, Apr 08 2024 *)

Prog

(PARI) gpf(n) = {my(p = factor(n)[, 1]); p[#p]; }
a(n) = valuation(prod(k = 2, n, gpf(k)), 10); \\ Amiram Eldar, Apr 08 2024
(PARI) \\ See link. David A. Corneth, Apr 08 2024

Crossrefs

Cf. A000079, A027868, A080193, A104350, A104356, A122840.

Sequence in context: A085290 A108611 A133875 * A235402 A092278 A105512

Adjacent sequences: A104352 A104353 A104354 * A104356 A104357 A104358

Keyword

nonn,base

Author

Reinhard Zumkeller, Mar 06 2005

Status

approved