22483

Properties

Appears in sequences

• Expansion of x/(1 - 5*x - 2*x^2).at n=7A015535
• Rounded total surface area of a regular dodecahedron with edge length n.at n=33A071397
• a(n) is the largest prime < 4*a(n-1) for n > 1, with a(1) = 2.at n=7A124190
• Numbers k such that 6*p(k)*p(k+1)*p(k+2)*p(k+3)*p(k+4)*p(k+5)-1 and 6*p(k)*p(k+1)*p(k+2)*p(k+3)*p(k+4)*p(k+5)+1 are twin primes with p(h) = h-th prime.at n=29A129311
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, -1, 1), (-1, 1, 0), (0, 1, 0), (1, -1, 0)}.at n=11A148175
• Primes in the Lucas U(5,-2) sequence.at n=1A201002
• Primes p with property that there exists a number d>0 such that numbers p-k*d, k=1...7, are seven primes.at n=29A216590
• Primes of the form 2*n^2 + 42*n + 19.at n=12A221903
• Non-palindromic balanced primes in base 16.at n=24A256090
• Primes 8k + 3 at the end of the maximal gaps in A269420.at n=9A269422
• a(n) = hypergeom([-2*n-1, 1/2], [2], 4) + (2*n+1)*hypergeom([-n+1/2, -n], [2], 4).at n=5A273019
• a(n) = Sum_{k=0..n} C(n,k)*((-1)^n*(C(k,n-k)-C(k,n-k-1))+C(n-k,k+1)).at n=11A273020
• Indices of primes in A000219.at n=41A285216
• a(1) = 1; a(2) = 1; for n >= 3, a(n) = a(n-1) / gcd(a(n-1), n-1) + a(n-2) / gcd(a(n-2), n-2).at n=38A330806
• Numbers k such that there are exactly four biquadratefree powerful numbers (A338325) between k^2 and (k+1)^2.at n=17A338391
• Primes p such that, if q is the next prime, p^2 + q is a prime times a power of 10.at n=22A352852
• Primes having only {2, 3, 4, 8} as digits.at n=35A386142
• a(n) = greatest prime less than prime(n)*prime(n+1).at n=34A391805
• Prime numbersat n=2515