21954

Appears in sequences

• a(0) = 1, a(n) = 28*n^2 + 2 for n>0.at n=28A010018
• a(n) = (n-1)*(n-2)*(n-3) + n.at n=29A034324
• a(n) = n^3 + 2.at n=28A084380
• Write n as Product_{i=1..k} prime(i)^e_i, where prime(i) is the i-th prime number and e_i is a nonnegative integer. a(n) = Sum_{i=1..k} e_i*n^(i-1).at n=27A090883
• Numbers n such that n/6 and prime(n)+/-n are all primes.at n=30A105550
• a(n) = Sum_{i=0..n} Sum_{j=0..n} (i XOR j), where XOR is the binary logical exclusive-or operator.at n=33A224923
• Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, southwest or northwest neighbor modulo 3 and the upper left element equal to 0.at n=12A266879
• a(n) = (5/128)*n^4*(n mod 2) + (((-5/128)*n^4*(n mod 2) - 26) mod n) + n^3 (n > 0).at n=27A294264
• a(n)/2^n is the expected value of the length of the longest palindromic suffix of a random length-n binary string.at n=11A320303
• Number of maximal subsets of {1..n} containing no differences or quotients of pairs of distinct elements.at n=37A326491
• Numbers that are the sum of five fourth powers in three or more ways.at n=36A344243
• Numbers that are the sum of five fourth powers in exactly three ways.at n=34A344244
• Numbers k that are a substring of xPy where k=concatenation(x,y) and xPy is the number of permutations A008279(x,y).at n=43A359012