19377

Appears in sequences

• a(0) = 1, a(n) = 31*n^2 + 2 for n>0.at n=25A010020
• Numbers k such that k^2 contains exactly 9 different digits.at n=33A054037
• Numbers whose square is a zeroless pandigital number (i.e., use the digits 1 through 9 once).at n=8A071519
• Number of proper divisors of n-th even perfect number.at n=20A133033
• Numbers of the form 56+p^2 (where p is a prime).at n=33A138690
• Ascending sequence of numbers such that the sum of any two distinct elements (even + odd) is a prime number.at n=38A180743
• Number of n X 3 binary arrays with rows and columns lexicographically nondecreasing and column sums nonincreasing.at n=14A266465
• Numbers whose square contains all of the digits 1 through 9.at n=8A294661
• Numbers k of the form 4m+1 for which A087808(sigma(k)) is equal to 2*A087808(k).at n=1A332445
• Numbers k such that any two consecutive decimal digits of k^2 differ by 1 after arranging the digits in decreasing order.at n=41A370362