22422

Appears in sequences

• a(n) = 2*a(n-1) + 2*a(n-2) - 3*a(n-3), with a(0) = 2, a(1) = 5, a(2) = 12.at n=11A019485
• Numbers having four 2's in base 10.at n=25A043500
• Palindromes that are divisible by 6.at n=37A045641
• Palindromic even lucky numbers.at n=29A045960
• Palindromes with exactly 4 distinct prime factors.at n=11A046394
• Palindromic untouchable numbers.at n=30A048187
• a(n) = smallest palindrome > a(n-1) such that a(1)*a(2)*...*a(n) + 1 is prime with a(1) = 2.at n=25A051896
• Palindromic even squarefree numbers with an even number of distinct prime factors.at n=18A075811
• Number of asymmetric rooted 2,3 cacti (triangular cacti with bridges).at n=12A091488
• a(n) = floor(n*exp(-csc(n))).at n=40A134913
• Numbers with digits 2 and 4 only.at n=34A284920
• k-digit numbers whose digit(s) are the number of distinct prime factors in each of the following k integers.at n=4A323083
• Expansion of Product_{k>=1} (1 + x^k) * (1 + x^(2*k)) * (1 + x^(3*k)) / ((1 - x^k) * (1 - x^(2*k)) * (1 - x^(3*k))).at n=16A327048
• a(n) = 2*(10^(2n+1)-1)/9 + 2*10^n.at n=2A332124