23819

Properties

Appears in sequences

• Number of 4-ary rooted trees with n nodes and height at most 8.at n=14A036613
• Primes p(k) such that the product of digits of p(k) equals the product of digits of k.at n=15A066521
• Primes of the form 4*k-1 such that 8*k-1 and 16*k-1 are also primes.at n=36A101791
• Subset of Sophie Germain primes generated by an iterative process starting from 11.at n=10A145918
• Primes p such that continued fraction of (1 + sqrt(p))/2 has period 6: primes in A146331.at n=26A146351
• Primes of the form 9*k^2-10*k+3.at n=14A154261
• Primes of the form (2*k^3 + 3*k^2 + k - 12)/6.at n=11A178608
• Least Ramanujan prime having a gap of 2n to the previous Ramanujan prime.at n=25A182875
• Primes of the form 6n^2 + 5.at n=22A201600
• Primes formed by inserting a semiprime between the semiprime's ordered factors.at n=4A229480
• Numbers m which satisfy the equation: (m - floor((m - k)/k)) mod k = 1 (1 <= k <= m) only for k = 2 and m - 1.at n=39A378275
• Prime numbersat n=2649