82128

Appears in sequences

• Palindromes with exactly 7 prime factors (counted with multiplicity).at n=12A046333
• Expansion of g.f. 1/(1-4*x*C) where C = (1/2-1/2*(1-4*x)^(1/2))/x = g.f. for Catalan numbers A000108.at n=7A076035
• Smallest palindromic multiple of n in which the digit string of n appears as sandwiched between at least a pair of digits, or 0 if n = 10k or no such number exists.at n=11A084043
• Riordan array (1/(1-4*x*c(x)),xc(x)), c(x) the g.f. of A000108.at n=28A117380
• Numbers k such that Fibonacci(prime(k)) is prime.at n=42A119984
• a(n) is the number which, when concatenated with A003226(n), the n-th automorphic number, gives (A003226(n))^2.at n=9A307104
• The number of edges in a Farey diagram of order (n,n).at n=6A358884