63890

Appears in sequences

• Numbers n such that n+prime(n) is the square of a prime.at n=12A104911
• Numbers n such that prime(n) + n is a prime power (A246547).at n=20A109314
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 841", based on the 5-celled von Neumann neighborhood.at n=38A273685
• a(n) = Sum_{j=1..n} Sum_{k=1..n} sigma(j*k).at n=17A372675