27730

Appears in sequences

• Number of partitions of n into parts not of the form 19k, 19k+7 or 19k-7. Also number of partitions with at most 6 parts of size 1 and differences between parts at distance 8 are greater than 1.at n=40A035976
• Number of distinct functions from a set with n^n elements to itself that can be defined naturally (in n) by typed lambda-calculus expressions.at n=11A065500
• a(n) = Sum_{i=1..n} LookAndSay(i).at n=34A079664
• Expansion of (1+x)^3/((1+x)^3+x^4).at n=26A099531
• Numbers of the form prime(n) + prime(n+1) - 2 that are also triangular numbers, T(k) = k(k+1)/2.at n=22A110891
• Triangular numbers equal to the sum of a prime number with its index.at n=21A115886
• a(n+1) = a(n) + (if a(n) is odd then (next odd square) else (next even square)), a(0) = 1.at n=28A116955
• The intersection of hexagonal numbers (A000384) and centered 9-gonal numbers (A060544).at n=39A272399
• Numbers k such that 459*2^k+1 is prime.at n=44A323199
• Triangular numbers that are the product of four distinct primes.at n=33A333771
• Hexagonal numbers that are products of exactly four distinct primes.at n=18A381920