DigitCount[n,b]
gives a list of the numbers of 
, 
, …, 
, 
digits in the base-b representation of n.
DigitCount[n]
gives a list of the numbers of 
, 
, …, 
, 
digits in the base-10 representation of n.
DigitCount
DigitCount[n,b,d]
gives the number of d digits in the base-b representation of n.
DigitCount[n,b,d,len]
gives the number of d digits in the base-b representation of the last len digits of n.
DigitCount[n,b]
gives a list of the numbers of 
, 
, …, 
, 
digits in the base-b representation of n.
DigitCount[n]
gives a list of the numbers of 
, 
, …, 
, 
digits in the base-10 representation of n.
Details
- Integer mathematical function, suitable for both symbolic and numerical manipulation.
- DigitCount[n] is equivalent to DigitCount[n,10,Mod[Range[10],10]].
Examples
open all close allBasic Examples (3)
Scope (2)
Count the number of each of the decimal digits in a number:
Do the same thing, explicitly specifying the base:
Count just the number of zeros:
Count the number of zeros, assuming a 9-digit number:
Count the number of digits 1 and 2 in ternary representation:
Count the number of digits 1 and 2 in the last 12 digits of the ternary representation:
Applications (2)
Thue–Morse sequence [more info]:
Number of black cells at step t in the rule 90 cellular automaton (binomial coefficients mod 2):
Properties & Relations (2)
DigitCount[n,b,d] is effectively Count[IntegerDigits[n,b],d]:
DigitCount[n,b,d,len] is effectively Count[PadLeft[IntegerDigits[n,b],len],d]:
Text
Wolfram Research (1999), DigitCount, Wolfram Language function, https://reference.wolfram.com/language/ref/DigitCount.html (updated 2025).
CMS
Wolfram Language. 1999. "DigitCount." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2025. https://reference.wolfram.com/language/ref/DigitCount.html.
APA
Wolfram Language. (1999). DigitCount. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/DigitCount.html