59904

Appears in sequences

• Values of phi(k) when phi(k) = phi(k+1).at n=39A003275
• Revert transform of 1 - x - x^3.at n=10A049140
• Numbers whose product of exponents is equal to the sum of prime factors.at n=38A071175
• a(n) = A074639(A074645(n)).at n=23A074646
• Sum of next n even interprimes.at n=21A075675
• Euler's totient of numbers containing in their decimal representation only the digits 0 and 1.at n=34A077811
• Expansion of (1-x)/(1-2*x^2+2*x^3).at n=20A078025
• Generalized Stirling2 array S_{4,4}(n,k).at n=9A090214
• Inverse modulo 2 binomial transform of 5^n.at n=7A100738
• a(n) = 2*a(n-2) + 2*a(n-3).at n=21A107383
• First position of A218860(n) in A066135.at n=24A218861
• a(n) = 4^(n-2) * (n+1)^(n-4) * (3*n^2 + 13*n + 16).at n=5A251584
• Numbers k such that sum of odd divisors of k equals sum of squares of primes dividing k.at n=20A252424
• Number of (n+1) X (n+1) 0..2 arrays with every 2 X 2 subblock diagonal maximum minus antidiagonal minimum unequal to its neighbors horizontally, vertically, diagonally and antidiagonally.at n=7A253461
• a(n) = (4*n+8)*n^2.at n=24A258617
• Number of permutations of n elements divided by the number of ternary heaps on n+1 elements.at n=23A273731
• Number of 2 X 2 matrices with entries in {0,1,...,n} and even determinant with no entry repeated.at n=18A277044
• Irregular triangle read by rows: normalized dimensions of certain generalized quadratic residue codes of length n.at n=50A287879
• Let f_k(n) be the result of applying phi (the Euler totient function A000010) k times to n; a(n) = n*Product_{k=1..oo} f_k(n).at n=38A291782
• Consider all 3 X 3 matrices M whose entries are the n-th to (n+8)-th primes prime(n), ..., prime(n+8), in any order. a(n) is the sum of the number of M such that det(M) is divisible by prime(n+i), for i from 0 to 8.at n=12A339105