75037

Properties

Appears in sequences

• a(n) is the least k > 0 such that sigma(k!) >= n*k!.at n=20A061556
• Smallest number m such that m#/phi(m#) >= n, where m# indicates the primorial (A034386) of m and phi is Euler's totient function.at n=19A091440
• Let a(n) be the n-th term of the sequence. Let m = primorial(a(n)); m is the minimum positive integer such that m/phi(m) >= n.at n=19A167348
• Convolution of (1,-1,2,-2,3,-3,...) and A000045 (Fibonacci numbers).at n=24A213043
• Primes of the form p*q - 30, where p and q are consecutive primes.at n=30A229613
• Primes p such that p^4-p^3+1 and p^4-p^3-1 are also primes.at n=32A238136
• Number of vertices of type D at level n of the hyperbolic Pascal pyramid PP_(4,5).at n=15A293065
• Prime numbersat n=7398