18918

Appears in sequences

• Numbers k such that 10*13^k + 1 is prime.at n=18A057464
• Interprimes which are of the form s*prime, s=18.at n=33A075293
• Number of compositions of n with equal number of even and odd parts.at n=19A098123
• Positive integers n such that the difference between the n-th prime and the sum of the divisors of n is congruent to 1 (mod n).at n=11A111359
• a(n) = 13 + floor(Sum_{j=1..n-1} a(j)/2).at n=18A120140
• Incorrect version of A045949.at n=18A229620
• Greatest integer k such that k/2^n < sqrt(1/3).at n=15A293327
• Numbers k sandwiched between twin primes, such that k times the reverse of k is also sandwiched between twin primes.at n=21A357076
• Number of subsets of {1,2,...,n} such that no two elements differ by 1, 3, 4, or 5.at n=31A375985
• Ulam numbers sandwiched between twin prime numbers.at n=32A380429