21736

Appears in sequences

• Sum of 10 positive 9th powers.at n=15A003399
• Number of ways to place a non-attacking white and black queen on n X n chessboard.at n=12A035291
• Number of partitions in parts not of the form 25k, 25k+1 or 25k-1. Also number of partitions with no part of size 1 and differences between parts at distance 11 are greater than 1.at n=47A036000
• Gaps of 8 in sequence A038593 (upper terms).at n=14A038656
• Number of partitions satisfying cn(1,5) < cn(2,5) + cn(3,5) and cn(4,5) < cn(2,5) + cn(3,5).at n=41A039888
• Successive maxima in sequence A007365.at n=12A065933
• Numbers n such that n and 2^n end with the same three digits.at n=21A067866
• Triangular numbers which are 6-almost primes.at n=17A076580
• Third row of Pascal-(1,6,1) array A081581.at n=30A081591
• Triangular numbers which are one more than a product of distinct triangular numbers.at n=16A083517
• Even pseudoprimes to base 9.at n=27A090083
• Triangle read by rows in which the n-th row contains the n smallest triangular numbers with the least significant digits of the n-th triangular number.at n=32A095225
• Triangular numbers that are the product of 2 palindromes greater than 1.at n=26A115744
• a(1) = a(2) = 1. a(n) = a(n-1) + (largest noncomposite {1 or prime} among the first n-2 terms of the sequence).at n=29A120761
• Triangular numbers that are the difference of nonnegative cubes.at n=10A129965
• Table T(n,k) by antidiagonals. T(n,k) is the number of primitive (=aperiodic) k-ary words with length less than or equal to n (n,k >= 1).at n=51A143326
• Triangular numbers n*(n+1)/2 with n and n+1 composite, where number of prime factors in n > number of prime factors in n+1.at n=39A144523
• Let S denote the palindromes in the language {0,1,2,...,n-1}*; a(n) = number of words of length 4 in the language SS.at n=21A187277
• Number of 1:2:sqrt(5) proportioned triangles on an (n+1) X (n+1) grid.at n=14A190099
• Numbers that set records for number of divisors of n(n-1).at n=26A192488