18797

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted then there are a pair of central terms both equal to 9.at n=29A031422
• Primes p from A031924 such that A052180(primepi(p)) = 11.at n=37A052232
• Indices of primes in sequence defined by A(0) = 21, A(n) = 10*A(n-1) + 41 for n > 0.at n=9A101961
• Primes with digit sum = 32.at n=9A106768
• Triangle read by rows: T(n,k) is the number of skew Dyck paths of semilength n and having k primitive Dyck factors (n >= 0; 0 <= k <= n).at n=45A129154
• Number of skew Dyck paths of semilength n that have no primitive Dyck factors.at n=9A129155
• Primes congruent to 9 mod 61.at n=35A142807
• Smaller member p of a pair (p,p+6) of consecutive primes in different centuries.at n=14A160370
• Shiraishi numbers: a parametrized family of solutions c to the Diophantine equation a^3 + b^3 + c^3 = d^3 with d = c+1.at n=24A226903
• Prime numbers P such that 8*P^2-1 and 8*(8*P^2-1)^2-1 are also prime numbers.at n=29A245674
• Number of nX6 0..1 arrays with every element equal to 0, 3, 5, 7 or 8 king-move adjacent elements, with upper left element zero.at n=16A298915
• Primes p such that the base-10 concatenations (p+1)||p and (p+1)||(p+1)||p are both prime.at n=36A309749
• Primes p such that p mod A001414(p-1) = p mod A001414(p+1).at n=44A339180
• Primes p such that q = p mod A001414(p-1) = p mod A001414(p+1) is prime.at n=24A339182
• E.g.f.: exp( exp(x) * (exp(x) - 1 - x) ).at n=8A347432
• Lesser p of a sexy prime pair such that (p-3)/2 is also the lesser prime of a sexy prime pair.at n=16A358571
• Smallest prime p such that the multiplicative order of 8 modulo p is n, or 0 if no such prime exists.at n=36A372798
• Prime numbersat n=2145