108643

Properties

Appears in sequences

• Beginning with 2, a(n+1) is the least prime == 1 (mod (Sum_{i=1..n} a(i))).at n=10A090474
• a(n) = prime(A096475(n)).at n=14A096476
• Smallest prime == 1 (mod f(n)), where f(n) = concatenation n,n-1,...,3,2,1.at n=4A109948
• Primes whose digit reversal is a pentagonal number (A000326).at n=29A115706
• a(n) = ceiling(A003269(n)/2).at n=41A173674
• Primes of form A038396(n) - 1 or A038396(n) + 1.at n=6A286661
• Numbers that are both prime-indexed primes and lucky-indexed lucky numbers.at n=31A307008
• E.g.f. satisfies A(x) = (1 + x) * exp(x * A(x)).at n=6A377826
• Prime numbersat n=10331