27890

Appears in sequences

• Number of 6-ary rooted trees with n nodes and height exactly 9.at n=16A036647
• a(n) = prime(n)^2 + 1.at n=38A066872
• a(n) = 81*n^2 - 72*n + 17.at n=19A154277
• Numbers of the form q-p, where p and q are prime and q = p^0+p^1+p^2+..+p^k for some k.at n=17A166388
• Append three digits, each increasing by one modulo 10 from the last digit of the nonnegative integers. 0 -> 123, 1 -> 1234 2 -> 2345, ... , 9 -> 9012, 10 -> 10123, etc.at n=27A167231
• The smallest numbers of every class in a classification of positive numbers (see comment).at n=40A247395
• Numbers m such that sigma(m-1) is a prime.at n=17A270413
• Numbers n such that prime(n) contains a substring of all the prime digits in order, i.e., "2357".at n=15A295708