20460

Appears in sequences

• a(n) = floor(n*phi^15), where phi is the golden ratio, A001622.at n=15A004930
• a(n) = round(n*phi^15), where phi is the golden ratio, A001622.at n=15A004950
• n! in base n.at n=6A006993
• Partial sums of A011863.at n=16A011888
• Positive numbers k such that k and 3*k are anagrams in base 7 (written in base 7).at n=29A023069
• a(n) = 3rd elementary symmetric function of the first n+2 positive integers congruent to 1 mod 4.at n=3A024379
• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 26.at n=10A031704
• Numbers k such that 73*2^k+1 is prime.at n=21A032386
• Numbers k whose decimal representation, read as a base-22 value and divided by k, yields an integer.at n=23A032575
• a(n) = (3*n+1)*(4*n+1).at n=41A033577
• Triangle read by rows, giving T(n,k) = number of k-member minimal ordered covers of a labeled n-set (1 <= k <= n).at n=17A049055
• Numbers k such that z(k) = j(k), where z(k) = sopf(k - d(k)), j(k) = d(sopf(k) + k), sopf(k) = A008472(k) and d(k) = A000005(k).at n=26A063961
• First differences of A069473.at n=4A069474
• Triangle read by rows: T(n,k) is the number of ordered trees having n edges and k branches of length 2.at n=36A101307
• n! in base 7.at n=7A127114
• a(n) = floor(n*t^n), where t=golden ratio=(1+sqrt(5))/2.at n=14A128439
• a(n) = n*Lucas(n).at n=15A146005
• Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11011-01110-00100 pattern in any orientation.at n=12A147484
• Expansion of 1/(1 - x + x^3 - 3*x^4 + x^5 - x^7 + x^8).at n=33A147593
• a(n) is the ratio of the sum of the bends of the spheres that are added in the n-th generation of Apollonian packing of three-dimensional spheres, using "strategy (a)" to count them (see the reference), to the sum of the bends of the initial five mutually tangent spheres.at n=6A154641