54761

Appears in sequences

• Binomial transform of generalized tetranacci numbers A073817: a(n)=Sum((-1)^k Binomial(n,k)*A073817(k),(k=0,..,n)).at n=19A075128
• Numbers k such that (31*10^k - 121) / 9 is prime.at n=25A111247
• Number of semiprimes s such that 2^n < s <= 2^(n+1).at n=18A120033
• a(n) = 40*n^2 + 1.at n=37A158602
• Consider a number n with m decimal digits, m>9. The sequence lists the numbers n such that the prefix of length m-1 and the suffix of length m-1 are both perfect squares.at n=40A244283
• Numbers whose second digit is not zero and such that removing either the first or last digit leaves a square number.at n=22A343855
• Numbers that are the sum of nine fifth powers in three or more ways.at n=6A345620
• Numbers that are the sum of nine fifth powers in exactly three ways.at n=6A346338
• Numbers that are both the concatenation of a Fibonacci number and a square and the concatenation of a square and a Fibonacci number.at n=9A361990