287297

Properties

Appears in sequences

• Smallest prime p such that tau(p-1) + tau(p+1) is n, or 0 if no such number exists.at n=44A090482
• Primes of the form 81*k^2 - 72*k + 17.at n=6A154276
• Continued fraction expansion for exp( Sum_{n>=1} 1/(n*A086594(n)) ), where A086594(n) = (4+sqrt(17))^n + (4-sqrt(17))^n.at n=8A174508
• Next prime of the form 4m^2 + 1 larger than A215233(n).at n=7A215234
• First of two consecutive (primes of the form n^2+1) with no semiprime of the same form between them.at n=11A242109
• a(n) = 8*n^3 - 6*n - 1.at n=33A369922
• Prime numbersat n=25019