27191

Properties

Appears in sequences

• a(n) = position of n^3 + (n+1)^3 + (n+2)^3 in A003072.at n=42A024972
• Primes with 26 as smallest positive primitive root.at n=1A061731
• Primes p such that googol - p is prime.at n=16A108252
• Numbers m such that greatest prime divisor of (m-th prime + 1) is 3.at n=30A121820
• G.f.: A(x) = (1/x)*series_reversion(x^2/G124344(x)), where G124344(x) is the g.f. of A124344 and satisfies: A(x)^2 = (1/x)*G124344(x*A(x)).at n=8A124890
• Number of elements less than 1/2 in the Cross Set which is the subset of the set of distinct resistances that can be produced using n unit resistors in series and/or parallel.at n=19A176498
• Primes p such that q = p^2 + p + 1 is an emirp.at n=36A178545
• Least prime k such that x' = k has n solutions, where x' is the arithmetic derivative (A003415) of x.at n=33A189559
• Least odd number k such that x' = k has n solutions, where x' is the arithmetic derivative (A003415) of x.at n=33A189560
• Primes of the form p*q - 30, where p and q are consecutive primes.at n=20A229613
• Numbers which can be decomposed as p*q + q*r + r*p (where p < q < r are distinct primes) in more ways than any smaller number.at n=13A237992
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 613", based on the 5-celled von Neumann neighborhood.at n=28A273243
• Smallest prime >= decimal expansion of e truncated to n places (A011543).at n=4A276196
• Primes p such that the absolute value of the fraction A241014(A000720(p)) / p is a record low.at n=11A339855
• a(n) is the least number that can be written in exactly n ways as p*q + q*r + p*r where (p,q,r) is an unordered triple of distinct primes.at n=33A356457
• Prime numbersat n=2978