146689

Appears in sequences

• a(n) = (10*n + 3)^2.at n=38A017306
• a(n) = (11*n + 9)^2.at n=34A017498
• a(n) = (12*n + 11)^2.at n=31A017654
• Numbers whose sum of divisors is prime.at n=23A023194
• Squares with digits in nondecreasing order.at n=29A028820
• Squares of primes having digits in nondecreasing order.at n=13A028866
• Composite numbers whose prime factors contain no digits other than 3 and 8.at n=35A036317
• Numbers k such that the sum of the cubes of divisors of k is a prime.at n=5A063783
• Numbers n such that sigma(d(n^3))==d(sigma(n^2)), where d(n) is the number of divisors of n.at n=28A063797
• Numbers k such that sigma(k)*phi(k) is squarefree.at n=31A065299
• Numbers n such that n and sigma(n) are prime powers (of the form p^k, p prime, k>=1).at n=30A071114
• Numbers k that require four iterations of the sigma function to be >= 2*k.at n=9A107914
• Squares of the form 5p - 6, where p is prime.at n=21A110481
• First n-digit number m such that sigma(m) is prime.at n=5A112722
• Numbers k such that sigma(k) - phi(k) is a brilliant number (A078972).at n=26A115917
• Squares that becomes a prime number when prefixed with a 9.at n=23A167724
• Odd numbers N for which numerator(sigma(N)/N) is a prime.at n=18A193065
• Numbers such that the sum of the cube of the odd divisors is prime.at n=30A195332
• Perfect squares which can be written neither as a^2+b^2, nor as a^2+2*b^2, nor as a^2+3*b^2, nor as a^2+7*b^2, with a > 0 and b > 0.at n=4A216408
• Numbers n such that the product of their proper divisors is a palindrome > 1 and not equal to n.at n=17A229970