22424

Appears in sequences

• Discriminants of quintic fields with 2 complex conjugates (negated).at n=38A023684
• Numbers k such that k^2+k+5 is a palindrome.at n=15A027718
• Numbers n with property that (n+1)*prime(n+1)-n*prime(n) is a perfect square s^2.at n=34A181283
• G.f.: 1 / Product_{n>=0} (1 - x^(n+4))^((n+1)*(n+2)*(n+3)/3!).at n=19A264924
• Numbers with digits 2 and 4 only.at n=35A284920
• Numbers k such that the sums (with multiplicity) of prime factors of k and k+1 are both squares.at n=23A359445
• Triangle read by rows: T(n,k) is the number of unlabeled connected weakly graded (ranked) posets with n elements and rank k.at n=38A361954
• Expansion of (1/x) * Series_Reversion( x*(1+x-x^5)/(1+x) ).at n=24A366101