cp's OEIS Frontend

A244265 Frequency of the most common final digit of a prime < 10^n.

%I A244265 #20 Jan 28 2025 14:35:46
%S A244265 1,7,46,310,2411,19665,166230,1440495,12712499,113765625,1029518337,
%T A244265 9401997000,86516427946,801235615814
%N A244265 Frequency of the most common final digit of a prime < 10^n.
%e A244265 Of the primes < 10^2, there are 7 that end in a 3. Since 3 is the most common digit to end with (see A244191), then a(2) = 7.
%o A244265 (Python)
%o A244265 import sympy
%o A244265 from sympy import isprime
%o A244265 def prend1(d, n):
%o A244265   lst = [ ]
%o A244265   for k in range(10**n):
%o A244265     if isprime(k):
%o A244265       lst.append((k%10**d))
%o A244265   new = 0
%o A244265   newlst = [ ]
%o A244265   for i in range(10**(d-1), 10**d):
%o A244265     new = lst.count(i)
%o A244265     newlst.append(new)
%o A244265   return max(newlst)
%o A244265 n = 2
%o A244265 while n < 10:
%o A244265   print(prend1(1, n), end=', ')
%o A244265   n += 1
%Y A244265 Cf. A244191.
%K A244265 nonn,base,hard,more
%O A244265 1,2
%A A244265 _Derek Orr_, Jun 24 2014
%E A244265 a(8)-a(14) from _Hiroaki Yamanouchi_, Jul 11 2014