18999

Appears in sequences

• Numbers whose base-5 representation contains exactly three 1's and three 4's.at n=30A045262
• Numbers k such that sigma(k-3) + sigma(k+3) = sigma(2*k).at n=21A067129
• Consider numbers of the form ...31975319753197531, whose digits read from the right are 1,3,5,7,9,1,3,5,7,9,1,... Sequence gives lengths of these numbers which are primes.at n=6A090743
• Least integer having a larger digital sum than the previous term and such that 10^(n-1) + a(n) is a prime.at n=16A199190
• Numbers that set a new integer record for the ratio between the product and the sum of their digits.at n=26A240520
• Number of compositions of n in which the maximal multiplicity of parts equals 6.at n=12A243123
• Records in A269415.at n=30A278031
• Number of positive subset sums of strict integer partitions of n.at n=37A284640
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(0) + b(1) + ... + b(n-1), where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences.at n=15A295053
• a(n) is the first member of A106843 with sum of digits n.at n=34A361831
• Composite numbers k such that the digits of k are in nondecreasing order while the digits of the concatenation of k's ascending order prime factors, with repetition, are in nonincreasing order.at n=28A372280