130649

Properties

Appears in sequences

• Number of times prime(n) occurs as the least prime factor among numbers 1 .. prime(n)^4: a(n) = A078898(A030514(n)).at n=26A250478
• a(n) is the largest prime p < 2^n such that p + 2^n is also prime.at n=15A282565
• Primes of the form 6k - 1 preceding the first-occurrence gaps in A334543.at n=20A334544
• Prime numbersat n=12220