24623

Properties

Appears in sequences

• Sum of n-th row of triangle in A082196.at n=34A082199
• Least prime p such that sigma(x)=sigma(p) has exactly n solutions.at n=22A115374
• Primes and their indices such that when their respective SOD's are both prime, the SOD of the index is the nextprime of the prime SOD.at n=39A117458
• a(n) = 76*n^2 - 1.at n=17A158765
• Number of 2 X 2 matrices having all elements in {0,1,...,n} and determinant in the closed interval [-n,n].at n=18A211031
• Number of 7 X n 0..1 arrays with antidiagonals unimodal and rows and diagonals nondecreasing.at n=8A224043
• Primes p such that floor(log(p)) + p^2 is prime.at n=38A225626
• Irregular array read by rows. a(n) is the largest element in the primitive Collatz-like 3x-k cycle associated with A226623(n).at n=20A226624
• Primes formed by inserting a semiprime between the semiprime's ordered factors.at n=5A229480
• Primes of the form (k^3 - k^2 - k - 1)/2 for some integer k > 0.at n=8A268063
• Records in A039654.at n=19A292112
• Positive-pan primes (see Comments).at n=38A332788
• Number of subsets of {1..n} whose elements have the same number of divisors.at n=41A339514
• Primes whose position in the Wythoff array is immediately followed by a prime both in the next column and the next row.at n=14A352537
• Number of integer partitions of n with different mean, median, and mode.at n=42A363720
• Primes having only {2, 3, 4, 6} as digits.at n=40A386140
• Prime numbersat n=2728