This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A323014 a(1) = 0; a(prime) = 1; otherwise a(n) = 1 + a(A181819(n)). 75
 0, 1, 1, 2, 1, 3, 1, 2, 2, 3, 1, 4, 1, 3, 3, 2, 1, 4, 1, 4, 3, 3, 1, 4, 2, 3, 2, 4, 1, 3, 1, 2, 3, 3, 3, 3, 1, 3, 3, 4, 1, 3, 1, 4, 4, 3, 1, 4, 2, 4, 3, 4, 1, 4, 3, 4, 3, 3, 1, 5, 1, 3, 4, 2, 3, 3, 1, 4, 3, 3, 1, 4, 1, 3, 4, 4, 3, 3, 1, 4, 2, 3, 1, 5, 3, 3, 3 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS Except for n = 2, same as A182850. Unlike A182850, the terms of this sequence depend only on the prime signature (A118914) of the index. LINKS MATHEMATICA dep[n_]:=If[n==1, 0, If[PrimeQ[n], 1, 1+dep[Times@@Prime/@Last/@FactorInteger[n]]]]; Array[dep, 100] CROSSREFS Positions of 1's are the prime numbers A000040. Positions of 2's are the proper prime powers A246547. Positions of 3's are A182853. Row lengths of A323023. Cf. A001221, A001222, A056239, A070175, A071625, A112798, A118914, A181819, A181821, A182850, A182857, A304465, A323022. Sequence in context: A294901 A305818 A303757 * A182850 A293227 A291208 Adjacent sequences:  A323011 A323012 A323013 * A323015 A323016 A323017 KEYWORD nonn AUTHOR Gus Wiseman, Jan 02 2019 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 6 04:14 EST 2019. Contains 329784 sequences. (Running on oeis4.)