31713

Appears in sequences

• Octal palindromes which are also primes.at n=31A006341
• Sorted k-factorial numbers (numbers of form k-1 excluded).at n=37A028687
• Sorted factorial and k-factorial numbers (numbers of form k-1 excluded).at n=43A028688
• Lucky numbers that are both palindromic and nonprime.at n=38A031880
• Base-10 palindromes that starts with 3.at n=39A043038
• Numbers that are palindromic, divisible by 11 and have an odd number of digits.at n=27A045571
• a(n) = (2^n - 1)*(4^n - 1).at n=5A060242
• Smallest multiple of n^2 beginning with n.at n=30A078210
• Smallest palindromic multiple of 2n-1 beginning with the digit string of 2n-1; or 0 if no such number exists.at n=15A083964
• Smallest palindromic multiple of n in which n is a substring (anywhere), or 0 if n = 10k or no such number exists.at n=30A084044
• a(n) = (n-1)^2*(n+1).at n=32A152618
• A vector recursion sequence: k = -3; m = 3; l = -3; a(n)=k*{0,a(n-2),0}+m*{-(m-1)/m,a(n-1)}++m*{a(n-1),-(m-1)/m}+l*{0,0,a(n-4),0,0}.at n=47A152655
• A vector recursion sequence: k = -3; m = 3; l = -3; a(n)=k*{0,a(n-2),0}+m*{-(m-1)/m,a(n-1)}++m*{a(n-1),-(m-1)/m}+l*{0,0,a(n-4),0,0}.at n=52A152655
• The non-repetitive Kaprekar binary numbers in decimal.at n=40A163205
• Number of 6-elements orbits of S3 action on irreducible polynomials of degree n > 1 over GF(2).at n=20A165921
• Palindromic composite numbers starting with a digit 3.at n=27A222726
• Palindromes greater than 10 whose sum of proper divisors is also a palindrome greater than 10.at n=9A227228
• Each term is a palindrome such that the sum of its proper divisors is a palindrome > 1.at n=13A227947
• A digitized pure tuning tone, sampled at standard settings for consumer audio: a(n) = floor(sin(2*Pi*(440/44100)*n)*32767).at n=21A320277
• a(n) = sum of row n of A348433 expressed as an irregular triangle.at n=10A348624