30075

Appears in sequences

• Numbers k such that the product of the first k composite numbers minus 1 is a prime.at n=28A057017
• Numbers k for which 2*k-1, 4*k-1, 8*k-1 and 16*k-1 are primes.at n=26A124494
• G.f. A(x) = 1 / (1 - x^a(0) / (1 - x^a(1) / (1 - x^a(2) / ... ))).at n=14A213411
• Arithmetic derivative of the prime-factorization representation of the n-th Stern polynomial: a(n) = A003415(A260443(n)).at n=25A278544
• Number of nX3 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=18A300501
• Arithmetic derivative of the primorial base exp-function: a(n) = A003415(A276086(n)).at n=53A327860
• Arithmetic derivative of the factorial base exp-function: a(n) = A003415(A276076(n)).at n=47A351950
• Denominator of ratio A003415(n) / A003415(A276086(n)), where A003415 is the arithmetic derivative and A276086 is the primorial base exp-function.at n=52A369039
• Numbers k such that (A276086(k)/s)^s >= k^(s-1) and A276086(k) <= A003415(k), where A003415 is the arithmetic derivative, A276086 is the primorial base exp-function, and s = bigomega(k).at n=29A370128
• Numbers k such that A322582(k) <= A276086(k) <= A348507(k).at n=35A392602
• Intersection of A392605 and A392611.at n=46A392606