180326

Appears in sequences

• "DHK" (bracelet, identity, unlabeled) transform of 1,1,1,1,...at n=23A032245
• Sum of primes dividing n^n+1 (with repetition).at n=13A064772
• a(n) is the minimal k such that nextprime(2k+1) - 2k = prime(n) where nextprime(n) is least prime > n.at n=24A229512