255191

Properties

Appears in sequences

• Primes p such that 1p1, 3p3, 7p7 and 9p9 are all primes.at n=31A059694
• Numerator of the polynomial A_l(x) = sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=6.at n=2A145619
• a(n) = numerator of polynomial of genus 1 and level n for m = 6 = A[1,n](6).at n=6A145664
• 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=28A237992
• a(n) equals the smallest Sophie Germain prime q such that pi_(p,2p+1)(q,10,(1,3)) - pi_(p,2p+1)(q,10,(3,1)) = n, where pi_(p,2p+1)(q,10,(b,c)) equals the number of Sophie Germain primes A005384(i) such A005384(i) <= q and (A005384(i),A005384(i+1)) == (b,c) (mod 10).at n=25A333084
• Positions of records in A369054.at n=26A369063
• Prime numbersat n=22458