21213

Appears in sequences

• Numbers n such that n | 5^n + 3^n +1.at n=14A057829
• Number of ways to partition the set of divisors of the n-th abundant number into three subsets such that their sums form an integer triangle.at n=28A091235
• Number of partitions of n having no parts equal to the size of their Durfee squares.at n=45A118199
• Squares in lunar arithmetic in base 4 written in base 4.at n=39A171460
• a(n) is the smallest number k such that d(1)*1! + d(2)*2! + ... + d(p)*p! = n^2, where d(i) are the decimal digits of k.at n=19A198095
• Triangle of coefficients of polynomials u(n,x) jointly generated with A210865; see the Formula section.at n=50A210864
• Terms k of A228058 such that gcd(k - A048250(k), A162296(k) - k) = A162296(k) - k.at n=32A325376
• Numbers k in A228058 such that also A001065(k) is in A228058.at n=29A325380
• Odd composites k such that sigma(k) has the same powerful part as k, where sigma is the sum of divisors function.at n=18A386425