23071

Properties

Appears in sequences

• Integer part of (4th elementary symmetric function of 3,4,...,n+5)/(3+4+...+n+5).at n=8A024192
• Numbers n such that n and prime(n) end with the same three digits.at n=17A067841
• Expansion of e.g.f. exp(x)*tan(2*x)/2.at n=7A084098
• Numbers n such that p(n),p(n)+6,p(n)+12,p(n)+18 are consecutive primes and p(n)=6*k+1 for some k, where p(n) denotes n-th prime.at n=34A090838
• a(0)=1; for n>=1, a(n) = the largest prime dividing n*a(n-1) + 1.at n=30A134486
• Primes p2 such that p1^3 + p2^2 is an average of twin primes and p1 < p2 are consecutive primes.at n=17A138755
• Primes p such that p^3-p^2-1 and p^3-p^2+1 are prime.at n=36A160858
• Run length of the n-th run of Fibonacci composites.at n=30A182600
• Primes of the form 6n^2 + 7.at n=25A201601
• Number of n X 7 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 0 1 and 1 1 0 vertically.at n=3A207390
• T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 0 1 and 1 1 0 vertically.at n=48A207391
• Number of 4Xn 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 0 1 and 1 1 0 vertically.at n=6A207393
• Number of (w,x,y) with all terms in {0,...,n} and |w-x| + |x-y| + |y-w| < w+x+y.at n=31A213488
• Numbers k such that 11^k + k^11 + 1 is prime.at n=4A216375
• Numbers k with same last four digits as p, prime(k)=p.at n=3A232189
• Primes p such that f(f(p)) is prime, where f(x) = x^4 + x^3 + x^2 + x + 1 = A053699(x).at n=23A237445
• Number of (n+1) X (4+1) 0..1 arrays with no 2 X 2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements.at n=13A251124
• Primes p such that p and prime(p) end with the same three digits.at n=4A271045
• Primes p such that p and prime(p) end with the same four digits.at n=1A271046
• Primes p such that both 2p-1 and 2p^2-2p+1 are prime.at n=25A274609