410881
domain: N
Appears in sequences
- Numbers k such that sigma_4(k)/sigma_2(k) is prime.at n=30A066109
- a(1) = 1; a(n) is the smallest square > a(n-1) which differs from it at every digit.at n=39A068854
- Smith square numbers.at n=14A098839
- Squares of lesser of twin primes.at n=28A108570
- Numbers n for which the absolute value of the abundance of both n and n^2 is a prime number.at n=34A125237
- Prime powers p^k with even exponents k > 0 such that (1 + p^k)/2 is prime.at n=31A192618
- Prime powers (A025475) representable as (p+q)/2, where p and q are distinct prime powers.at n=36A225388
- Perfect powers m^k such that m, k and m+k are primes.at n=32A258400
- Square numbers in A070552.at n=24A263951
- Odd squares not of the form p + 2^k with p prime.at n=7A276567