A191475 Values of i of the numbers 2^i*3^j (A033845).

1, 2, 1, 3, 2, 4, 1, 3, 5, 2, 4, 1, 6, 3, 5, 2, 7, 4, 1, 6, 3, 8, 5, 2, 7, 4, 1, 9, 6, 3, 8, 5, 2, 10, 7, 4, 1, 9, 6, 3, 11, 8, 5, 2, 10, 7, 4, 12, 1, 9, 6, 3, 11, 8, 5, 13, 2, 10, 7, 4, 12, 1, 9, 6, 14, 3, 11, 8, 5, 13, 2, 10, 7, 15, 4, 12, 1, 9, 6, 14, 3, 11

Offset

1,2

Comments

Not the same as A158456.

Links

Zak Seidov, Table of n, a(n) for n = 1..10000

Example

a(10) = 2 because A033845(10) = 108 = 2^2*3^3.
a(100) = 2 because A033845(100) = 59872 = 2^8*3^7.
a(1000) = 56 because A033845(1000) = 216172782113783808 = 2^56*3^1.

Mathematica

mx = 1000000; t = Select[Sort[Flatten[Table[2^i 3^j, {i, Log[2, mx]}, {j, Log[3, mx]}]]], # <= mx &]; Table[FactorInteger[i][[1, 2]], {i, t}] (* T. D. Noe, Aug 31 2012 *)

Crossrefs

Cf. A033845 (numbers 2^i*3^j), A191476 (values of j), A158456.

Sequence in context: A336472 A058933 A087470 * A158456 A084531 A023129

Adjacent sequences: A191472 A191473 A191474 * A191476 A191477 A191478

Keyword

nonn

Author

Zak Seidov, Aug 30 2012

Status

approved