1423249
domain: N
Appears in sequences
- a(n) = prime^2 and digits of prime appear in a(n).at n=27A030081
- Odd numbers k such that 2^k mod k = 2^(k+2) mod (k-2) is also an odd number.at n=1A056740
- Squares of the form k^2+(k+23)^2 with integer k.at n=8A156572
- a(n) = 34*a(n-1) - a(n-2) - 4232 for n > 2; a(1)=1369, a(2)=42025.at n=2A156574
- a(1) = 1; a(n) is the smallest square > 2*a(n-1).at n=18A175627
- Odd numbers N for which numerator(sigma(N)/N) is a prime.at n=36A193065
- Numbers k such that tau(sigma(tau(k))) = sigma(tau(sigma(k))), where tau is A000005 and sigma is A000203.at n=31A237613
- Numbers n such that both sigma(n) and sigma(n) - 2 are primes.at n=12A274963
- Odd numbers with prime sum of divisors.at n=34A278911
- Number of minimal total dominating sets in the n-Moebius ladder.at n=20A303162
- Numbers k for which A348717(k) is a multiple of A348717(sigma(k)).at n=47A364131