81000000
domain: N
Appears in sequences
- Squares with digits in nonincreasing order.at n=34A028822
- Third column of triangle A055864.at n=8A055070
- a(n) = 81*10^(n-2), a(0)=1, a(1)=8.at n=8A055996
- Numbers k such that k and k^2 use only the digits 0, 1, 5, 6 and 8.at n=42A136870
- Common difference in sets of 5 consecutive palindromic primes (palprimes) in arithmetic progression.at n=3A229783
- Common difference in sets of 5 consecutive palindromic primes (palprimes) in arithmetic progression.at n=4A229783
- Common difference in sets of 5 consecutive palindromic primes (palprimes) in arithmetic progression.at n=7A229783
- Common difference in sets of 5 consecutive palindromic primes (palprimes) in arithmetic progression.at n=8A229783
- Numbers n such that the number of digits d in n is not prime and for each factor f of d the sum of the d/f digit groupings of size f is a square.at n=29A258660
- Powers k^m, m > 1, where k is an Achilles number whose squarefree kernel is a primorial.at n=25A389226
- Powers k^m, m > 1, where k is an Achilles number that has a primorial kernel but is not a product of primorials.at n=9A389374