40311

Appears in sequences

• Numbers k such that k through k+4 all have the same number of divisors.at n=7A049051
• a(n) = (n-1)!-n^tau(n)/n^2.at n=7A069152
• Numbers k such that k and k+1 are both of the form p*q^3 where p and q are distinct primes.at n=30A215173
• Numbers n such that sigma(n+1) - sigma(n-1) = k*n for some integer k, where sigma(n) = A000203 (sum of divisors of n).at n=40A223137
• a(n) = 1*2*3*4*5*6*7*8 - 9*10*11*12*13*14*15*16 + 17*18*19*20*21*22*23*24 - ... + (up to n).at n=8A319549
• The numbers of a square spiral with 1 in the center, lying at integer points of the right branch of the parabola y=n^2.at n=10A357281
• Numbers k such that one of k-A001414(k) and k+A001414(k) is a prime and the other is the square of a prime.at n=17A358002
• Numbers k such that A075255(k) is the square of a prime.at n=28A386954