19511

Appears in sequences

• Numbers k such that sigma(k) = sigma(k+8).at n=21A015876
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 25 ones.at n=11A031793
• Numerators of continued fraction convergents to sqrt(429).at n=6A041816
• a(n) = floor(e^n mod n^e).at n=37A066433
• Number of positive integers <= 10^n that are divisible by no prime exceeding 5.at n=22A106598
• Members of A038512 of the form k, k+2, k+6, k+8.at n=28A155511
• Floor(1/{(5+n^4)^(1/4)}), where {}=fractional part.at n=28A184629
• Number T(n,k) of permutations of [n] with exactly k (possibly overlapping) occurrences of some of the consecutive step patterns UUD, UDU, DUU (U=up, D=down); triangle T(n,k), n>=0, 0<=k<=max(0,n-3), read by rows.at n=24A231384
• Number of permutations of [n] avoiding simultaneously consecutive step patterns UUD, UDU, DUU (U=up, D=down).at n=9A231385
• Composite numbers for which the root mean square of proper divisors is an integer.at n=24A247135
• Numbers n such that sum of the proper divisors of n is the square of the sum of the digits of n.at n=11A279459
• Solution of the complementary equation a(n) = 2*a(n-1) - a(n-3) + b(n-2), where a(0) = 2, a(1) = 4, a(2) = 6, b(0) = 1, b(1) = 3, b(2) = 5, and (a(n)) and (b(n)) are increasing complementary sequences.at n=16A295618
• Number of nX3 0..1 arrays with every element unequal to 1, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero.at n=10A305010
• Unitary Ruth-Aaron numbers: numbers k such that A008475(k) = A008475(k+1).at n=16A331000