1190281
domain: N
Appears in sequences
- Numbers whose sum of divisors is prime.at n=37A023194
- a(n) = prime^2 and digits of prime appear in a(n).at n=23A030081
- Numerators in expansion of (exp(x)-1)^3.at n=16A065974
- Smallest composite k such that phi(k) > k*(1-1/n^2).at n=32A069639
- Convolution of Jacobsthal(n) and 3^n.at n=13A094705
- Smith square numbers.at n=24A098839
- Numbers k that require four iterations of the sigma function to be >= 2*k.at n=19A107914
- First n-digit number m such that sigma(m) is prime.at n=6A112722
- Cyclops squares: squares (A000290) that are also cyclops numbers (A134808).at n=21A160711
- Odd numbers N for which numerator(sigma(N)/N) is a prime.at n=32A193065
- Numbers k such that tau(sigma(tau(k))) = sigma(tau(sigma(k))), where tau is A000005 and sigma is A000203.at n=27A237613
- Square numbers in A070552.at n=36A263951
- Odd numbers with prime sum of divisors.at n=30A278911
- Powers (A001597) that are also cyclops numbers (A134808).at n=21A285845
- Numbers m such that m! / sigma(m) is not an integer.at n=38A325436
- Numbers k for which A348717(k) is a multiple of A348717(sigma(k)).at n=43A364131