69623

Properties

Appears in sequences

• Primes p such that p-30, p, p+30 are consecutive primes.at n=0A053075
• Number of positive integers <= 2^n of form 7 x^2 + 9 y^2.at n=20A054188
• First occurrence of distances of equidistant lonely primes. Each equidistant prime is at the same distance (or has the same gap) from the preceding prime and the next prime.at n=5A054342
• a(0)=0, a(1)=1, a(n) = smallest prime >= a(n-1) + a(n-2).at n=23A055498
• a(0)=0, a(1)=1, a(n) = smallest prime > a(n-1)+a(n-2).at n=22A055499
• Equidistant lonely primes. Each prime is the same distance (gap) from the preceding prime and the next prime. These distances are maximal: each distance is larger than all such previous distances.at n=4A058867
• Duplicate of A054342.at n=5A058869
• Square loops: the number of circular permutations (reversals not counted as different) of the numbers 1 to n such that the sum of any two consecutive numbers is a square.at n=14A071984
• Apart from initial 0, same as A055498.at n=23A073021
• Each term is the smallest prime > the sum of the previous 2 terms.at n=22A073022
• Smallest prime p such that both p +/- 2n are primes closest to p, or zero if no such prime exists.at n=14A103709
• Prime numbers with gaps larger than 20 towards both neighboring primes.at n=36A163112
• Primes of the form 5n^2 + 3.at n=22A201482
• Balanced primes which are the average of two successive semiprimes.at n=32A212820
• The hyper-Wiener index of the straight pentachain of n pentagonal rings (see Fig. 2.1 in the A. A. Ali et al. reference).at n=16A224460
• Number of integer compositions of n with the same length as the absolute value of their alternating sum.at n=23A357183
• Prime numbersat n=6906