84211

Properties

Appears in sequences

• Primes of form 210*p + 1 where p is a prime.at n=37A051648
• Let P(k) = floor(k/2). Start with n, apply P repeatedly until reach 1. a(n) = concatenation of numbers obtained.at n=15A083177
• Let n! = 2^a*3^b*5^c*7^d.... in canonical form, then a(n) = concatenation a,b,c,d,...at n=10A093881
• Primes arising as the digitwise backward concatenation of terms of A110746.at n=3A110747
• Number of tilings of a 18 X n rectangle using 3n hexominoes of shape I.at n=15A251075
• a(1) = 1; thereafter a(n+1) is obtained by prepending the digit-sum of a(n) to a(n).at n=4A372075
• Prime numbersat n=8209