40363

Appears in sequences

• Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 10000-11111-00001 pattern in any orientation.at n=13A147068
• a(n) = 42*n^2 + 1.at n=31A158604
• a(n) is the difference between multiples of 11 with even and odd decimal digit sum in interval [0,10^n).at n=6A212594
• a(n) = 1/15*(128*n^5 + 320*n^4 + 80*n^3 - 200*n^2 + 92*n - 15).at n=4A212670
• Squarefree numbers (A005117) with prime factors in a prime(k) + k progression.at n=11A232169
• Squarefree numbers (A005117) of form prime(k)*q where q = primes of the form prime(k) + k.at n=10A232170
• Worst cases for Hart's one-line factorization (OLF) method with multiplier M = 1, see comments.at n=11A284522
• a(1) = 1; a(n) = 1 + a(n-1) + Sum_{k=2..n} a(floor(n/k)).at n=47A351621