30270

Appears in sequences

• a(n) is the concatenation of n and 9n.at n=29A009474
• Absolute value of difference between counts of uninterrupted runs of single nonprimes in A093183 and A093184.at n=11A093397
• a(n) = 36*n^2 - 6.at n=28A158462
• Sums of 3 distinct primorials.at n=29A177697
• Number of strings of length n over a 6-letter alphabet that do not begin with a palindrome.at n=6A252699
• Numbers with at least three digits and with the property that the sum of the cubes of the first and last digit equals the number obtained when the first and last digits are deleted.at n=44A275343
• Numbers that are the sum of distinct primorial numbers (A002110) (not including 1).at n=43A290249
• Numbers n such that the arithmetic derivative of A276086(n) is prime.at n=38A328233
• Triangle T(n,d) read by rows: the number of mixed trees with n>=1 nodes and 0<=d<n arcs.at n=48A335362
• Table read by upward antidiagonals: T(n,k) is the number of strings of length k over an n-letter alphabet that do not begin with a palindrome of two or more letters; n, k >= 1.at n=60A342238
• Numbers k such that A003415(k) >= A276086(k) and gcd(k, A003415(k)) = gcd(k, A276086(k)), where A003415 is the arithmetic derivative, and A276086 is the primorial base exp-function.at n=38A369959
• Sums of three primorials > 1.at n=43A370137