A025659 Exponent of 6 (value of j) in n-th number of form 5^i*6^j.

0, 0, 1, 0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 4, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 6, 0, 1, 2, 3, 4, 5, 6, 7, 0, 1, 2, 3, 4, 5, 6, 7, 8, 0, 1, 2, 3, 4, 5, 6, 7, 8, 0, 9, 1, 2, 3, 4, 5, 6, 7, 8, 0, 9, 1, 10, 2, 3, 4, 5, 6, 7, 8, 0, 9, 1, 10, 2, 11, 3, 4, 5, 6, 7, 8, 0, 9, 1, 10, 2, 11, 3, 12, 4, 5, 6, 7, 8, 0, 9, 1, 10

Offset

1,6

Links

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

Formula

a(n) = A122841(A025622(n)). - Amiram Eldar, Nov 08 2025

Mathematica

seq[lim_] := IntegerExponent[Flatten[Table[5^i*6^j, {i, 0, Log[5, lim]}, {j, 0, Log[6, lim/5^i]}]] // Sort, 6]; seq[10^10] (* Amiram Eldar, Nov 08 2025 *)

Crossrefs

Cf. A025622, A025651, A122841.

Sequence in context: A025650 A025674 A025681 * A163351 A166352 A025690

Adjacent sequences: A025656 A025657 A025658 * A025660 A025661 A025662

Keyword

nonn,easy

Author

David W. Wilson

Status

approved