28087

Properties

Appears in sequences

• Numbers having four 6's in base 8.at n=30A043448
• Primes followed by a [10,2,10] prime difference pattern of A001223.at n=25A052376
• Expansion of (1-2*x^3)/(1-2*x-x^3+2*x^4).at n=15A057744
• a(n) = Sum_{d divides n} (-1)^(n/d+1)*d^3.at n=31A078307
• Smallest prime that is the sum of prime(n) consecutive primes.at n=26A082277
• 7th row of number array A083064.at n=5A083068
• First subdiagonal of number array A083064.at n=5A083071
• Erroneous version of A115016.at n=5A103494
• Incorrect version of A115016 caused by reading Table 4.4 of the reference without noticing that a(4) was omitted.at n=5A104642
• a(n) is the smallest number k that has a shortest addition chain whose length A003313(k) = A003313(n*k), or 0 if this never happens.at n=6A115016
• Numbers k such that A003313(k) = A003313(7*k).at n=0A116462
• a(0)=a(1)=a(2)=1, a(n) = a(n-1) + a(n-2) + 2*a(n-3) for n > 2.at n=16A122552
• a(n) = n^5-n^4-n^3-n^2-n-1.at n=8A125083
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, -1, 1), (0, 1, -1), (1, 0, 1)}.at n=11A148288
• Primes p dividing every A167859(m) from m=(p-1)/2 to m=(p-1).at n=33A167860
• Primes of the form 10n^2 - 3.at n=13A201962
• a(n) = prime(k-1) with k = n^2 + prime(n)^2.at n=15A243893
• P(n,k) is an array read by rows, with n > 0 and k=1..5, where row n gives the chain of 5 consecutive primes {p(i), p(i+1), p(i+2), p(i+3), p(i+4)} having the symmetrical property p(i) + p(i+4) = p(i+1) + p(i+3) = 2*p(i+2) for some index i.at n=14A267028
• Primes such that A271229(n) = prime(n).at n=34A276649
• Expansion of x*(1 + x)/((1-2*x)*(1+x+x^2)).at n=16A294627