24109

Properties

Appears in sequences

• Number of fullerenes with 2n vertices (or carbon atoms).at n=29A007894
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 80 ones.at n=30A031848
• Last member of a sexy prime quadruple: value of p+18 such that p, p+6, p+12 and p+18 are all prime.at n=38A046124
• Let p = prime(sigma(n)) and q = prime(phi(n)), then p is in the sequence if p-q = 6.at n=30A103176
• Centered 28-gonal numbers.at n=41A195314
• The Riemann primes of the psi type and index 1.at n=36A197185
• Let p_(4,1)(m) be the m-th prime == 1 (mod 4). Then a(n) is the smallest p_(4,1)(m) such that the interval(p_(4,1)(m)*n, p_(4,1)(m+1)*n) contains exactly one prime == 1 (mod 4).at n=34A210475
• Primes p such that floor(log(p)) + p^2 is prime.at n=33A225626
• Number of n X n binary arrays with top left value 1 and no two ones adjacent horizontally, diagonally or antidiagonally.at n=4A228654
• Number of n X 5 binary arrays with top left value 1 and no two ones adjacent horizontally, diagonally or antidiagonally.at n=4A228657
• T(n,k)=Number of nXk binary arrays with top left value 1 and no two ones adjacent horizontally, diagonally or antidiagonally.at n=40A228660
• Number of 5 X n binary arrays with top left value 1 and no two ones adjacent horizontally, diagonally or antidiagonally.at n=4A228664
• Primes p such that b=2*p+1 is semiprime, c=2*b+1 is 3-almost prime and d=2*c+1 is 4-almost prime.at n=21A235646
• Primes p such that q = p^2 + 10 and q^2 + 10 are also prime.at n=28A243368
• Greatest of 4 consecutive primes with consecutive gaps 6, 4, 2.at n=28A290635
• Greatest integer k such that k/2^n < 1/e.at n=16A293339
• The integer k that minimizes |k/2^n - 1/e|.at n=16A293341
• Primes p such that 5*p+6, 5*p+12, 5*p+18 and 5*p+24 are all primes.at n=16A355577
• Prime numbersat n=2684