66066

Appears in sequences

• Stirling numbers of the second kind S(n+3, n).at n=11A001297
• Palindromic triangular numbers.at n=13A003098
• Number of genus 2 rooted maps with 1 face with n vertices.at n=3A006298
• Stirling numbers of second kind S2(14,n).at n=10A011563
• Triangle read by rows giving number of ways to glue sides of a 2n-gon so as to produce a surface of genus g.at n=18A035309
• Smallest triangular number containing exactly n 6's.at n=3A036523
• Numbers having four 6's in base 10.at n=12A043516
• Palindromic binomial coefficients C(n,k) for k >= 2.at n=20A051641
• a(n) = n*(n^2 - 1)*(n + 2)*(n^2 + 4*n + 6)/72.at n=12A054563
• Palindromic hexagonal numbers.at n=7A054969
• Triangular numbers whose digit reversal is also a triangular number.at n=22A061455
• Triangular numbers with every digit a triangular number.at n=17A062100
• Triangular numbers that contain exactly 2 different digits.at n=22A062691
• Triangular numbers whose reverse is also triangular.at n=15A066569
• Largest n-digit palindromic triangular number, or 0 if no such number exists.at n=4A068643
• a(1) = 3; a(n) = smallest palindromic multiple of a(n-1).at n=5A068665
• Triangular numbers such that both the number formed by the first floor((k+1)/2) digits and the remaining part (if any) are triangular numbers, where k is the number of digits.at n=14A068821
• Triangular numbers using only the curved digits 0, 3, 6, 8 and 9.at n=16A079653
• Palindromic numbers that set a new record for number of palindromic divisors.at n=12A084324
• Triangular numbers in which the sum of the external digits equals the sum of the internal digits.at n=19A088289