24501

Appears in sequences

• a(n) = L(n+1) + c(n) where L(k) = k-th Lucas number and c(n) is n-th number that is 1 or not a Lucas number.at n=19A022802
• Sum of n-th Lucas number greater than 3 and n-th number that is 1 or is not a Fibonacci number.at n=18A023489
• a(n) = b(n) + d(n), where b(n) = (n-th Lucas number > 3) and d(n) = (n-th non-Lucas number).at n=18A023495
• a(n) = A026907(2*n, n-2).at n=4A026911
• Number of partitions of n with equal nonzero number of parts congruent to each of 0 and 3 (mod 4).at n=49A035548
• Semiprimes (A001358) whose digit reversal is a pentagonal number (A000326).at n=30A115708
• Triangle, read by rows, of the limit of coefficients of q in {[x^m] W(x,q)} as m grows when arranged into a triangle where row n is multiplied by n! for n>=1.at n=17A126343
• a(n) = 20*n^2 + 1.at n=35A158493
• Semiprimes of the form 5*n^2 + 1.at n=24A212707
• Number of binary arrays indicating the locations of trailing edge maxima of a random length-n 0..4 array extended with zeros and convolved with 1,4,6,4,1.at n=21A221995
• If n is composite, replace n with the concatenation of its nontrivial divisors, written in increasing order, each divisor being written in base 10 with its digits in reverse order, otherwise a(n) = n.at n=19A361320