57240

Appears in sequences

• Number of n-step mappings with 4 inputs.at n=27A005945
• a(n) = (2*n+1)*(3*n+1)*(4*n+1).at n=13A033591
• Numbers k such that 2^k - 1 is divisible by (k-1).at n=34A087965
• Numbers k such that sigma(k) divides k^2.at n=30A090777
• a(n) = (n+1)*binomial(2n+2,n+1)-3*4^n+binomial(2n,n).at n=6A112328
• Numbers k such that k*(k+9) gives the concatenation of two numbers m and m-9.at n=3A116231
• Decagonal numbers divisible by 10.at n=24A117797
• a(n) = 6*a(n-1) - 6*a(n-2).at n=7A140766
• Numbers n for which the terms of the multiplicative sequence {n^2/A049417(n)} are integers.at n=34A185288
• Numbers with prime factorization p*q*r^3*s^3 (where p, q, r, s are distinct primes).at n=33A190108
• Number of binary arrays indicating the locations of trailing edge maxima of a random length-n 0..5 array extended with zeros and convolved with 1,2,1.at n=22A222124
• Expansion of (eta(q^5) * eta(q^10) / (eta(q) * eta(q^2)))^2 in powers of q.at n=18A227213
• Positive numbers m such that m^2 - 1 divides 2^m - 1.at n=17A247219
• Positive numbers m such that m^2 - 1 divides 4^m - 1.at n=30A271842
• Numbers i such that Fibonacci(i) is divisible by i, i+1, i+2, and i+3.at n=20A298685
• Number of 4-cycles in the n-polygon diagonal intersection graph.at n=42A300552
• Numbers m such that m | A000385(m-1) = Sum_{k=1..m-1} sigma(k) * sigma(m-k).at n=26A326608
• Number of length-n ternary words having at most 5 palindromic subwords (including the empty word).at n=41A329023
• Numbers k such that k +- 2 and k +- 3 are all semiprimes.at n=19A382049