199809

Appears in sequences

• a(n) = (11*n + 7)^2.at n=40A017474
• a(n) = (12*n + 3)^2.at n=37A017558
• List of pairs of consecutive refactorable numbers.at n=13A036898
• Perfect powers pp(n) with perfect power index n.at n=30A075433
• Squares for which the sum of the digits, the product of the digits, the digital root and the multiplicative digital root are all squares.at n=27A117680
• Squares for which both the sum of the digits and the product of the digits is a triangular number.at n=24A118490
• Largest perfect square less than 2*10^n.at n=5A126981
• Squares k such that k - 2 and k + 2 are prime.at n=13A144938
• Six-digit squares that are concatenation of two 3-digit primes.at n=7A153050
• Squares that become a prime number when prefixed with a 5.at n=11A167720
• Squares that become prime numbers when prefixed with an 8.at n=18A167723
• Squares n^2 that become prime after omitting all ones in their decimal expansion.at n=13A175983
• Perfect squares k such that each decimal digit of k is equal to the difference of at least two other digits of k.at n=6A255893
• Number of entries in the seventh cycles of all permutations of [n].at n=4A285235
• Squares whose arithmetic mean of digits is 6 (i.e., the sum of digits is 6 times the number of digits).at n=5A316486
• Rotationally ambigrammatic square numbers with no trailing zeros.at n=27A340164
• a(n) is the smallest number m such that tau(m - 1) = tau(m + 1) = tau(m) + n or 0 if no such m exists, where tau(k) = A000005(k).at n=23A350934
• Numbers N of the form m^k in ascending order having the property that for any choice of m and k such that N = m^k, the sets of distinct digits of m, k, and m^k are pairwise disjoint.at n=28A353057
• Square numbers whose iterative sums of digits are squares.at n=43A384296
• Number of integer compositions of n whose maximal runs of k's all have length > k, for all k.at n=45A389511