67189

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 20.at n=19A031608
• Primes whose digit reversal is a pentagonal number (A000326).at n=22A115706
• Elements of A005282 that are also the sum of a pair of not necessarily distinct elements of A005282.at n=19A133604
• Total sum of the numbers of partitions with positive k-th ranks of all partitions of n.at n=33A208479
• Primes p such that both prevprime(p^2) - 2 and nextprime(p^2) + 2 are also primes.at n=21A226986
• Number of (n+1)X(4+1) 0..3 arrays with no element unequal to a strict majority of its horizontal, diagonal and antidiagonal neighbors, with values 0..3 introduced in row major order.at n=6A231460
• Prime numbersat n=6695