23335

Appears in sequences

• a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (composite numbers), t = (primes).at n=32A024604
• Number of proper factorizations of p1^n*p2^4, where p1 and p2 are distinct primes.at n=17A031127
• Numbers k such that k^2 contains only digits {2,4,5}.at n=10A031154
• Number of partitions of n with equal nonzero number of parts congruent to each of 3 and 4 (mod 5).at n=49A035571
• Numerators of continued fraction convergents to sqrt(115).at n=10A041208
• Numerators of continued fraction convergents to sqrt(460).at n=6A041876
• Image of partition numbers (A000041) under "little Hankel" transform that sends [c_0, c_1, ...] to [d_0, d_1, ...] where d_n = c_n^2 - c_{n+1}*c_{n-1}.at n=23A056222
• Numbers n such that sigma(n)=phi(n*bigomega(n)-1).at n=36A067877
• Numbers k such that k and k^2 use only the digits 0, 2, 3, 4 and 5.at n=44A136882
• Numbers k such that k and k^2 use only the digits 1, 2, 3, 4 and 5.at n=28A136968
• Numbers k such that k and k^2 use only the digits 2, 3, 4 and 5.at n=4A137066
• Numbers k such that k and k^2 use only the digits 2, 3, 4, 5 and 6.at n=14A137067
• Numbers k such that k and k^2 use only the digits 2, 3, 4, 5 and 7.at n=5A137068
• Numbers k such that k and k^2 use only the digits 2, 3, 4, 5 and 8.at n=13A137069
• Numbers k such that k and k^2 use only the digits 2, 3, 4, 5 and 9.at n=14A137070
• Numbers k with d digits such that all digits of k and the last d+1 digits of k^2 are prime.at n=6A154780
• Total number of even parts in the last section of the set of partitions of n.at n=38A206434
• Least number k >= 0 such that (n!-k)/n is prime.at n=62A245696
• Numbers k such that prime(k) + {1,2,3,4,5,6} are all products of three primes.at n=4A255194
• Numbers n such that prime(n) + {1, 2, 3, 4, 5, 6} are all products of the same number of primes (not necessarily all distinct).at n=4A255202