26141

Properties

Appears in sequences

• a(n) = (1/1 - 1/(n-1) + ... + d/binomial(n-[ n/2 ],[ n/2 ]))*L, where L = LCM{1, n-1, ..., binomial(n-[ n/2 ],[ n/2 ])}, d = (-1)^n.at n=11A025580
• a(n) = p^2 - sum of digits of p^p, where p = prime(n).at n=38A140499
• a(n) = 6^n-5^n-4^n-3^n-2^n-1.at n=6A147977
• Primes whose reversal - 1 is a square.at n=38A167218
• Primes of the form 6n^2 + 5.at n=23A201600
• Hyperartiads.at n=24A270798
• Number of maximal primitive subsets of {1..n}.at n=49A326077
• Square array T(n,k) = k^n - Sum_{0 < i < k} e(i)*(k-i)^n where e(i) = 1 if the partial sum up to this term would remain <= k^n, or 0 else; n, k >= 1; read by falling antidiagonals.at n=60A332099
• a(n) = n^n - (n-1)^n - (n-2)^n - ... - 1^n.at n=5A341331
• Primes p such that (q*s-p*r)/2 and |p*s-q*r|/2 are both prime, where p,q,r,s are consecutive primes.at n=29A341802
• a(n) is the number of distinct volumes > 0 of tetrahedra with edges of integer length whose largest is n.at n=16A371345
• Stationary differences in A342447: a(n) = A342447(2k-n+1,k)-A342447(2k-n,k) which does not depend on k if k>= 2n-2 (for n>0).at n=7A376894
• Prime numbersat n=2873