23742

Appears in sequences

• Maximal value of sum(p(i)p(i+1),i=1..n), where p(n+1)=p(1), as p ranges over all permutations of {1,2,...,n}.at n=40A110610
• Number of binary strings of length n with no substrings equal to 0000 1001 or 1011.at n=18A164444
• The number of meandering curves of order n, with both extremity covered by its arcs.at n=10A217318
• Number of foldings of n labeled stamps in which both end leaves are inwards.at n=10A223095
• Numbers k with k - 1, k + 1, prime(k) - k, prime(k) + k, k*prime(k) - 1, k*prime(k) + 1 all prime.at n=1A232861
• Triangular array: For n >= 2 and 0 <= k <= n - 2, T(n, k) equals the number of rooted duplication trees on n gene segments whose leftmost visible duplication event is (k, r), for 1 <= r <= (n - k)/2.at n=49A264869
• Sums of two primes (in increasing order) when equal to the product of their prime-counting functions.at n=11A272860
• Expansion of Sum_{k>=0} x^(k^2) / Product_{j=1..k} (1 - j*x^j).at n=29A318770
• Number of different values of (x_n, x_1*x_2*...*x_n) where x_1=1 and x_i-x_{i-1} is 0 or 1.at n=17A334636
• Midpoints k of a pair of twin primes such that sigma(k) is also the midpoint of a pair of twin primes.at n=35A349981
• Ulam numbers sandwiched between twin prime numbers.at n=37A380429