24787

Appears in sequences

• Becomes prime after exactly 8 iterations of f(x) = sum of prime factors of x.at n=5A047827
• Numbers k such that the smoothly undulating palindromic number (15*10^k - 51)/99 is a prime.at n=9A062211
• Numerator of Sum_{k=1..n} k/phi(k).at n=18A068885
• Interprimes which are of the form s*prime, s=7.at n=26A075282
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 0), (0, 0, 1), (0, 1, -1), (1, -1, 0)}.at n=11A148095
• a(n) = 729*n + 1.at n=33A158397
• a(n) = 34*n^2 + 1.at n=27A158586
• Number of 0..n arrays x(0..6) of 7 elements with zero 4th differences.at n=35A200274
• Expansion of 1 / ((1-x)^2*(1-x^2)*(1-x^3)*...*(1-x^10)).at n=31A288345
• Numbers that are the sum of four third powers in seven or more ways.at n=9A345150
• Numbers that are the sum of four third powers in exactly seven ways.at n=8A345151