70841

Properties

Appears in sequences

• a(n) = (10*n^3 - 9*n^2 + 2*n)/3 + 1.at n=28A034721
• Constant term of the reduction by x^2 -> x+1 of the polynomial p(n,x) defined below in Comments.at n=20A192746
• Number of n X 2 binary arrays indicating whether each 2 X 2 subblock of a larger binary array has lexicographically nondecreasing rows and columns, for some larger (n+1) X 3 binary array with rows and columns of the latter in lexicographically nondecreasing order.at n=21A227252
• a(n+1) is the smallest prime > a(n) such that the digits of a(n) are all (with multiplicity) contained in the digits of a(n+1), with a(1)=7.at n=13A242907
• Initial members of prime quadruples (n, n+2, n+36, n+38).at n=34A248367
• Primitive prime factors of the cyclotomic polynomial sequence Phi(7,k) in the order in which they occur.at n=23A256146
• Primes equal to an octagonal number plus 1.at n=28A285792
• Lesser of twin primes for which phi(p-1) < phi(p+1).at n=18A286715
• Prime numbers p such that 3*p - 2 is the square of a prime number.at n=25A289135
• a(n) is the number of decompositions of F(n,1) into disjoint unions of F(j,k) and G(q,r) where F(j,k) is the set of numbers { i*k, 0 <= i <= j } and where G(q,r) is the set of numbers { (2*p-1)*r, 1 <= p <= q }.at n=28A335631
• Prime numbersat n=7012