66593

Properties

Appears in sequences

• a(n) = a(1) + a(2) + ... + a(n-1) + a(m) for n >= 4, where m = n - 1 - 2^p and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = a(2) = a(3) = 1.at n=17A049934
• Reduced binary string self-substitutions: a(n) is obtained by substituting n for each 1-bit in the binary expansion of n, then dividing by n.at n=22A065160
• Primes p such that the largest prime factor of p^5 + 1 is less than p.at n=20A102327
• Primes from merging of 5 successive digits in decimal expansion of Pi.at n=18A104825
• Larger of two consecutive prime numbers, p1 and p2 = p1 + d, such that p1*p2*d - d is the average of twin primes.at n=7A153379
• Primes of the form 2n^2+14n+5.at n=30A154577
• Smallest prime p of the form prime(n)+k^2 such that sum of digits(p) = prime(n).at n=9A178237
• Wiener index of a benzenoid consisting of a double-step spiral chain of n hexagons (n>=2, s=21; see the Gutman et al. reference).at n=22A193397
• Primes of the form 3n^2 - 10.at n=24A201782
• Prime numbersat n=6640