20179

Appears in sequences

• a(n) = (117*n^2 - 99*n + 2)/2.at n=19A050408
• Least k such that gcd(prime(k)+1, prime(k+1)+1) = 2n.at n=23A067603
• Number of primes < prime(n)^3.at n=17A086688
• Numbers k such that 6*p(k)*p(k+1)*p(k+2)*p(k+3)*p(k+4)*p(k+5)-1 and 6*p(k)*p(k+1)*p(k+2)*p(k+3)*p(k+4)*p(k+5)+1 are twin primes with p(h) = h-th prime.at n=27A129311
• a(1)=1, a(n) = a(n-1) + n^5 if n odd, a(n) = a(n-1) + n^0 if n is even.at n=6A140162
• Number of partitions p of n such that median(p) >= multiplicity(max(p)).at n=37A240211
• Number of partitions of n into 9 parts such that every i-th smallest part (counted with multiplicity) is different from i.at n=19A244245
• Numbers k at which point A336459(k) appears multiplicative, but A051027(k) does not.at n=35A336561
• Numbers k such that A353802(k) / sigma(sigma(k)) is an integer > 1, where A353802(n) = Product_{p^e||n} sigma(sigma(p^e)).at n=10A353807
• Position of n-th appearance of 2n in the sequence of prime gaps (A001223). If 2n does not appear at least n times, set a(n) = -1.at n=23A356223