18266

Appears in sequences

• Aliquot sequence starting at 660.at n=20A014362
• Number of integer points (x,y,z) at distance <= 0.5 from sphere of radius n.at n=38A016728
• Numbers k such that the continued fraction for sqrt(k) has period 59.at n=26A020398
• Sum of next n composite numbers.at n=30A072475
• Indices of primes in sequence defined by A(0) = 83, A(n) = 10*A(n-1) + 13 for n > 0.at n=17A101067
• Numbers k such that the difference between k-th prime and next prime is 70.at n=3A116493
• Number of permutations of 1..n containing the relative rank sequence { 263415 } at any spacing.at n=3A159169
• a(n) = Sum_{k<=n} A007955(k), where A007955(m) = product of divisors of m.at n=22A175318
• Number of days after Jan 01 1000 such that the date written in the format DDMMYYYY is palindromic.at n=16A210885
• Number of n X 2 nonnegative integer arrays with upper left 0 and every value within 3 of its city block distance from the upper left and every value increasing by 0 or 1 with every step right or down.at n=12A252822
• Numbers k such that tau(k) + tau(k+1) + tau(k+2) + tau(k+3) = 16, where tau is the number of divisors function A000005.at n=18A350686
• Number of partitions of n that do not contain odd primes as parts.at n=51A355195
• a(n) is the number of asymmetrical polyiamonds of n cells.at n=12A359688
• a(1) = 1, a(2) = 2; for n >= 3, a(n) = (n-1)^3 - a(n-1) - a(n-2).at n=37A361134