20219

Properties

Appears in sequences

• Primes p whose period of reciprocal equals (p-1)/11.at n=5A056216
• Area under Motzkin excursions.at n=9A057585
• Duplicate of A056216.at n=5A098678
• Primes congruent to 41 mod 59.at n=34A142768
• Primes congruent to 28 mod 61.at n=36A142826
• Numbers n such that (19^n - 2^n)/17 is prime.at n=7A229542
• Lengths of runs of the initial digits of semiprimes in decimal representation, cf. A239634.at n=47A239639
• Primes p such that 2*(p^2-1) - 1 and 2*(p^2-1) + 1 are also primes.at n=46A247101
• Prime time primes on 6-digit clocks, second definition: primes of the form HMMSS where H, MM, SS are primes, H < 24, MM and SS < 60.at n=0A295013
• Prime time numbers on 6-digit clocks: numbers of the form HMMSS where H, MM, SS are primes, H < 24, MM and SS < 60.at n=7A295014
• Triangle read by rows: T(n,k) is the number of unlabeled connected multigraphs with n edges on k nodes and degree >= 3 at each node, loops allowed, n >= 2, 1 <= k <= floor(2*n/3).at n=59A360862
• Prime numbersat n=2286