23980

Appears in sequences

• a(n) = 1000*n - 20.at n=23A157515
• a(n) = 2662*n + 22.at n=8A157613
• Number of strings of numbers x(i=1..5) in 0..n with sum i^2*x(i) equal to n*25.at n=26A183956
• Numbers k such that sum of the divisors of k equals the sum of the reversals of the divisors of k. Numbers with all palindrome divisors are not in the sequence.at n=17A196677
• Number of self-inverse permutations p on [n] where the maximal displacement of an element equals 9.at n=12A238920
• a(n) = [x^n] Product_{k=1..n} 1/(1-k^k*x).at n=3A299035
• Coefficients in the expansion of Product_{m>=1} (1 - q^(13*m))/(1 - q^m).at n=38A341714
• a(n) = prime(n)*(prime(n-1) + prime(n+1)).at n=27A357679
• Long legs of the only primitive Pythagorean triple whose inradius is the n-th prime and whose short leg is an odd number.at n=28A367573
• Table read by rows: row n is the unique primitive Pythagorean triple (a,b,c) such that (a-b+c)/2 = A002378(n) and its long leg and hypotenuse are consecutive natural numbers.at n=28A385022