69480

Appears in sequences

• G.f.: (1 + x^4 + x^7 + 2*x^8 + x^9 + x^12 + x^16)/Product_{i=1..8} (1 - x^i).at n=46A003405
• Fibonacci sequence beginning 1, 16.at n=19A022106
• Convolution of Lucas numbers and (F(2), F(3), F(4), ...).at n=16A023619
• Fixed points of iteration in A077091.at n=7A077092
• Smallest initial values leading to fixed points listed in A077092.at n=7A077093
• Numbers k such that if you subtract k-reversed from k you get a natural number with the same digits as k.at n=21A121969
• Smallest number k such that prime(n) divides the n-th divisor of k.at n=42A226101
• Number of permutations i_1,...,i_n of 1,...,n with i_1 = 1 and i_n = n, and with the n adjacent sums i_1+i_2, i_2+i_3, ..., i_{n-1}+i_n, i_n+i_1 all coprime to n.at n=13A228860
• Prime sieve of the square root of 2.at n=8A248831
• 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=10A339105