56238

Appears in sequences

• G.f. satisfies: 36*A(x) = 35 + 81*x + A(x)^9, starting with [1,3,12].at n=5A120606
• Number of 4-element subsets that can be chosen from {1,2,...,4*n} having element sum 8*n+2.at n=32A204468
• Numbers k such that the concatenation of 2^k - 1 and 2^(k - 1) - 1 is prime.at n=25A301806
• Products of 5 distinct primes that are sandwiched between twin prime numbers.at n=38A376380