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!)
 A275806 a(n) = number of distinct nonzero digits in factorial base representation of n. 11
 0, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 2, 1, 2, 2, 2, 1, 2, 1, 2, 2, 2, 2, 3, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 1, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 1, 2, 2, 3, 3, 3, 2, 3, 1, 2, 2, 2, 2, 3, 2, 2, 2, 2, 3, 3, 2, 3, 3, 3, 2, 3, 1, 2, 2, 2, 2, 3, 1, 2, 2, 2, 2, 3, 2, 2, 2, 2, 3, 3, 2, 3, 3, 3, 2, 3, 2, 3, 3, 3, 3, 4, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,6 LINKS Antti Karttunen, Table of n, a(n) for n = 0..40320 FORMULA a(n) = A001221(A275735(n)). a(n) = A060502(A225901(n)). Other identities. For all n >= 0: a(n) = a(A153880(n)) = a(A255411(n)). [The shift-operations do not change the number of distinct nonzero digits.] a(A265349(n)) = A060130(A265349(n)). a(A000142(n)) = 1. a(A033312(n)) = n-1, for all n >= 1. EXAMPLE For n=0, with factorial base representation (A007623) also 0, there are no nonzero digits, thus a(0) = 0. For n=2, with factorial base representation "10", there is one distinct nonzero digit, thus a(2) = 1. For n=3, with factorial base representation "11", there is just one distinct nonzero digit, thus a(3) = 1. For n=44, with factorial base representation "1310", there are two distinct nonzero digits ("1" and "3"), thus a(44) = 2. PROG (Scheme) (define (A275806 n) (A001221 (A275735 n))) (Python) from sympy import prime, primefactors from operator import mul import collections def a007623(n, p=2): return n if n

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 16 09:06 EST 2019. Contains 330020 sequences. (Running on oeis4.)