60481

Appears in sequences

• Strong pseudoprimes to base 76.at n=31A020302
• Strong pseudoprimes to base 77.at n=16A020303
• Braided power sequence: A065692 is b(n+1) = 3*b(n) + 2*d(n) - c(n), this is c(n+1) = 3*c(n) + 2*b(n) - d(n) and A065694 is d(n+1) = 3*d(n) + 2*c(n) - b(n), starting with b(0) = 0, c(0) = 1 and d(0) = 2.at n=8A065693
• Primonacci numbers: a(n)=a(n-2)+a(n-3)+a(n-5)+a(n-7)+a(n-11)+...+a(n-p(k))+... until n <= p(k), where p(k) is the k-th prime. a(1)=a(2)=1.at n=30A078465
• a(n) = Sum_{d|n} (n-1)!/(d-1)!.at n=8A087906
• Sieve performed by successive iterations of steps where step m is: keep m terms, remove the next 4 and repeat; as m = 1,2,3,.. the remaining terms form this sequence.at n=16A112562
• a(n) = (n!+6)/6.at n=6A139153
• Let S denote the palindromes in the language {0,1,2,...,n-1}*; a(n) = number of words of length 4 in the language SS.at n=30A187277
• Numbers k such that -3 is a quadratic residue (not necessarily coprime) modulo k, k + 1, k + 2 and k + 3.at n=32A318527
• Where records occur in A304480.at n=44A335116
• a(n) = Sum_{d|n} (-1)^(n/d+1) * (n-1)!/(d-1)!.at n=8A352013
• a(n) = (n-1)! * Sum_{d|n} (-1)^(d+1) / (d-1)!.at n=8A363736
• Expansion of e.g.f. exp(x/(1 - x^4)^(1/4)).at n=9A373519