34335

Appears in sequences

• Odd numbers k such that abs(sigma(k)-2k) <= sqrt(k). Abundance-radius = abs(sigma(k)-2k) does not exceed square root of k and k is odd.at n=18A087415
• Odd numbers n such that abs(sigma(n)-2n) <= n^(1/3). Abundance-radius = abs(sigma(n)-2n) does not exceed cubic root of n and n is odd.at n=8A088010
• Numbers k such that 2*k-1, 4*k-1, 6*k-1 and 8*k-1 are primes.at n=22A124487
• Numbers k such that sopfr(k + bigomega(k)) = sopfr(k).at n=34A187877
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+161)^2 = y^2.at n=30A206426
• Odd numbers n such that 2n/sigma(n) - 1 = 1/x for some positive integer x.at n=20A222263
• Number of (n+1) X (1+1) 0..2 arrays with no element equal to all horizontal neighbors or equal to all vertical neighbors, and new values 0..2 introduced in row major order.at n=6A238906
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with no element equal to all horizontal neighbors or equal to all vertical neighbors, and new values 0..2 introduced in row major order.at n=21A238912
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with no element equal to all horizontal neighbors or equal to all vertical neighbors, and new values 0..2 introduced in row major order.at n=27A238912
• Numbers n such that n and n+1 both have 24 divisors.at n=11A274362
• Numbers k such that k and k+1 are both phi-practical numbers (A260653).at n=37A330871
• Numbers k such that the odd part of (1+k) divides (1 + odd part of sigma(k)).at n=23A336700
• Numbers k for which A000265(1+A000265(sigma(k))) is equal to A000265(1+k).at n=8A336701
• Numbers m with deficiency 30: sigma(m) - 2*m = -30.at n=6A389700