49169

Properties

Appears in sequences

• Numbers k such that 6*10^k + R_k is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=19A056717
• Frobenius number of the numerical semigroup generated by four consecutive tetrahedral numbers.at n=16A069761
• Expansion of 1/(x^k*(1-x-2*x^(k+1))) for k=8.at n=40A143451
• Let m = A002445(n); then a(n) = largest member of A001359 (the lesser twin primes sequence) <= m.at n=24A156053
• Smallest twin prime > 3*2^n.at n=13A208573
• Union of A208572 and A208573.at n=26A208574
• Lesser of twin primes p, p+2 such that prime(p) and prime(p+2) are also twin primes.at n=30A332968
• Position of the first occurrence of n in A337474.at n=47A337476
• Prime numbersat n=5053