39387

Appears in sequences

• Expansion of 1/((1-x)(1-7x)(1-11x)).at n=4A016254
• a(1) = 2; a(n+1) = a(n)-th composite.at n=44A022450
• Numbers k for which phi(k) + anti-phi(k) = k.at n=31A066418
• Apocalypse primes: 10^665+a(n) has 666 decimal digits and is prime.at n=25A115983
• Numbers k such that 2^k-61 is prime.at n=41A182156
• a(n) = number of tuples (a,b,c,d) of natural numbers a,b,c,d <= n with gcd(a,b)=gcd(b,c)=gcd(c,d)=gcd(d,a)=1.at n=19A256391