18979

Properties

Appears in sequences

• Number of connected regular graphs with n nodes.at n=12A005177
• Number of partitions of n with equal number of parts congruent to each of 1 and 4 (mod 5).at n=50A035558
• Primes p such that q-p = 22, where q is the next prime after p.at n=34A061779
• Lesser of two consecutive primes such that p + n*q is a perfect square, p < q.at n=45A064543
• Primes p such that the largest prime divisor of p^4+1 is less than p.at n=2A102326
• Greatest prime factor of A104357(n) = A104350(n) - 1.at n=12A104359
• Primes with digit sum = 34.at n=1A106769
• Primes congruent to 5 mod 53.at n=39A142535
• Primes congruent to 40 mod 59.at n=33A142767
• Primes congruent to 8 mod 61.at n=38A142806
• Primes of the form 2n^2+18n+7, n>=0.at n=11A154592
• Primes p such that 4*p is greater than the greatest prime factor of p^4 -1 and p^4 + 1.at n=4A218849
• Numbers m with C(2*m, m) + prime(m) prime, where C(2*m, m) = (2*m)!/(m!)^2.at n=46A236242
• Number of length 3 1..(n+1) arrays with every leading partial sum divisible by 2, 3, 5 or 7.at n=33A258634
• Triangle read by rows: T(n,k) = number of graphs with n nodes and k connected regular components.at n=66A275420
• a(n) is the least prime p such that the orderly concatenation of the n successive powers of p yields a prime number; a(n)=0 if n is a multiple of 6.at n=35A292163
• Numbers k such that A000700(k) is divisible by k.at n=3A304044
• Numbers k such that the largest prime divisor of k^4+1 is less than k.at n=23A309562
• Number of integer partitions of n whose multiplicities all appear the same number of times.at n=49A325333
• Number of compositions of n whose run-lengths are all equal.at n=19A329738