24920

Appears in sequences

• The sequence M(n) in A022905.at n=34A022908
• a(n) = A027082(n, n+4).at n=10A027086
• a(n) = A027082(n, 2n-10).at n=9A027097
• Composite numbers k such that sigma(k)*(phi(k) + 2) is a square.at n=33A065655
• a(n)=number of Catalan knight paths in right half-plane from (0,0) to (n,1).at n=13A096610
• For positive n with prime decomposition n = Product_{j=1..m} (p_j^k_j) define A_n = Sum_{j=1..m} (p_j*k_j) and B_n = Sum_{j=1..m} (p_j^k_j). This sequence gives those n for which A_n and B_n are both prime and B_n = A_n + 2 (i.e., form a twin prime pair).at n=44A185718
• Number of partitions of n having population standard deviation >= 2.at n=38A238662
• Number of partitions p of n such that mean(p) > multiplicity(max(p)).at n=38A240202
• Numbers n such that floor((3/2)^n)-floor((3/2)^(n-1)) is a prime number.at n=30A243591
• Number of n-digit numbers whose base-10 representations can be written as the concatenations of 0 or more prime numbers (also expressed in base 10).at n=5A246806
• Number of permutations sigma of [n] without fixed points such that sigma^6 = Id.at n=9A261317
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 606", based on the 5-celled von Neumann neighborhood.at n=39A273206
• Sum of the seventh largest parts in the partitions of n into 10 parts.at n=47A326592