24821

Properties

Appears in sequences

• Number of partitions of 1/n into 4 reciprocals of positive integers.at n=25A020327
• Least prime in A031938 (lesser of primes differing by 20) whose distance to the next 20-twin is 6*n.at n=13A052359
• Numbers n such that 1n1, 3n3, 7n7 and 9n9 are all primes.at n=33A059677
• Primes p such that 1p1, 3p3, 7p7 and 9p9 are all primes.at n=8A059694
• 3n^3 + 2n^2 + n + 1.at n=20A130884
• Sum of squares of five consecutive primes.at n=17A131686
• Primes which have a partition as the sum of squares of five consecutive primes.at n=6A133559
• Sequence defined by the recurrence formula a(n+1)=sum(a(p)*a(n-p)+k,p=0..n)+l for n>=1, with here a(0)=1, a(1)=9, k=1 and l=1.at n=6A177125
• T(n,k)=Number of nXk 0..1 arrays with rows, diagonals and antidiagonals unimodal.at n=47A223669
• Number of 3 X n 0..1 arrays with rows, diagonals and antidiagonals unimodal.at n=7A223670
• Expansion of phi(x) / phi(x^2) * f(-x, -x^7) / f(-x^3, -x^5) in powers of x where phi(), f() are Ramanujan theta functions.at n=40A230534
• The number of P-positions in the game of Nim with up to five piles, allowing for piles of zero, such that the total number of objects in all piles doesn't exceed 2n.at n=16A238147
• Least prime p = prime(n)^2 + prime(n+1)^2 + prime(n+2)^2 + prime(n+3)^2 + q^2, where q > prime(n+3) is also prime.at n=16A263724
• Number of nX4 0..1 arrays with every element equal to 0, 3, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero.at n=8A299317
• Number of compositions of n with cuts-resistance <= 2.at n=17A330028
• Number of compositions of n such that every subsequence has a different sum.at n=47A335357
• Primes that are the sum of some number of consecutive prime squares.at n=21A376916
• Prime numbersat n=2745