19691

Appears in sequences

• Number of positive integers <= 2^n of form 2 x^2 + 5 y^2.at n=17A000286
• Numbers that are the sum of 11 positive 8th powers.at n=33A003389
• Numbers that are the sum of 9 positive 9th powers.at n=10A003398
• Number of parts in all partitions of n into distinct parts.at n=49A015723
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 13 ones.at n=37A031781
• a(n) = smallest palindrome > a(n-1) such that a(1)*a(2)*...*a(n) + 1 is prime with a(1) = 2.at n=22A051896
• Numbers n for which there are exactly ten k such that n = k + reverse(k).at n=15A072434
• Integer part of the fourth nesting of the logarithmic integral of 10^n.at n=8A096354
• 3^(n^2)+2^n.at n=3A120798
• Palindromes that are the sum of two positive cubes.at n=9A162710
• a(n) = smallest number that leads to a new cycle under the base-3 Kaprekar map of A164993.at n=11A165009
• Triangle T(n, k, q) = binomial(n, k) + q^n*binomial(n-2, k-1) - 1 with T(n, 0) = T(n, n) = 1 and q = 3, read by rows.at n=46A173047
• Triangle T(n, k, q) = binomial(n, k) + q^n*binomial(n-2, k-1) - 1 with T(n, 0) = T(n, n) = 1 and q = 3, read by rows.at n=53A173047
• Positive integers of the form (6*m^2 + 1)/11.at n=34A179337
• Palindromic numbers which are sum of consecutive squares.at n=28A180436
• a(n) = 3^(2*n + 3) + 2^n.at n=3A188526
• Palindromic numbers which can be written as the sum of two or more consecutive squares.at n=19A216446
• Numbers n such that in Collatz (3x+1) trajectory of n, the number of terms < n equals number of terms > n.at n=42A217731
• Numbers which are the sum of two positive cubes and divisible by 29.at n=12A224483
• a(n) = 3*9^n + 8.at n=4A224790