23676

Appears in sequences

• Numbers k such that 145*2^k+1 is prime.at n=21A032422
• Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,21.at n=31A064247
• Values of n such that N=(an+1)(bn+1)(cn+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,33.at n=5A064253
• Numbers m such that N = (am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,55.at n=5A065696
• Indices of primes in A001644 (the Lucas 3-step numbers).at n=30A104576
• n+p(n)+p(p(n)) is a palindrome, where p(n) denotes the n-th prime.at n=37A116037
• a(n) = 27*n^2 - 21*n + 6 (n>=1).at n=29A304164
• G.f. satisfies A(x) = 1 - x*(1 - 2*A(x)^3).at n=6A364437