72250

Appears in sequences

• Numbers k such that k | 13^k + 1.at n=38A015963
• Numbers n that are the hypotenuse of exactly 17 distinct integer-sided right triangles, i.e., n^2 can be written as a sum of two squares in 17 ways.at n=5A097239
• a(n) = floor(volume of 4-sphere of radius n).at n=11A210519
• Numbers that are representable in at least two ways as sums of four distinct nonvanishing cubes.at n=16A259060
• Indices of primes in A266891.at n=35A304210
• Starts of runs of 4 consecutive numbers that have mutually distinct exponents in their prime factorization (A130091).at n=19A342030
• The smallest number k that can be partitioned in n ways as the sum of two numbers from A020487.at n=16A369384
• a(n) = Sum_{k=1..n} sigma( (n/gcd(k,n))^2 ).at n=39A372227