18753

Appears in sequences

• Fibonacci sequence beginning 0, 19.at n=16A022353
• a(n) = s(n+3)/4, where s is A024949.at n=13A024950
• Numbers k such that 219*2^k+1 is prime.at n=37A032486
• a(n) = 3*(2*5^n + 1).at n=5A097804
• a(n) = (n^4 + 2n^3 + 5n^2 + 4)/4.at n=16A123350
• Numbers n such that phi(n) = phi(n+12) and n is not divisible by 2.at n=27A217141
• Goodstein sequence starting with a(1) = 16: to calculate a(n) for n>1, subtract 1 from a(n-1) and write the result in the hereditary representation base n, then bump the base to n+1.at n=3A222113
• a(k) such that A225258 column k of T(n,k) = n*k^3 - a(k) for large n.at n=35A225263
• Composite squarefree numbers k such that the arithmetic mean of the distinct prime factors of k is a prime p, and p divides k.at n=30A229094
• Sums of the next n consecutive nonsquare integers.at n=33A275740
• Records in A333549.at n=33A333550
• First occurrence of n in A334144.at n=44A333959
• Numbers which are the product of two S-primes (A057948) in exactly three ways.at n=14A343828
• a(n) = 2*binomial(n,2) + 3*binomial(n,3) + 4*binomial(n,4).at n=19A384852