47939

Properties

Appears in sequences

• Primes in which odd positioned digits are composite and even positioned digits are primes. The least significant digit is the taken to be the first digit.at n=39A083821
• a(n) = (9 + 14*n + 12*n^2 + 4*n^3)/3.at n=32A166911
• Primes of the form n + sum of proper non-divisors of n.at n=32A192560
• a(1)=3; for n>1, if n is odd a(n) = spf(Product_{k=1..n-1}(a(k))+1) else a(n) = spf(Product_{k=1..n-1}(a(k))-1), where spf is "smallest prime factor".at n=24A265009
• Primes, starting with a(1)=2, whose successive differences are increasing triangular numbers.at n=21A278139
• Initial member of 6 consecutive primes a, b, c, d, e, f such that both (f + a)/(d - c) and (e + b)/(d - c) are prime.at n=20A293619
• Prime numbersat n=4940