27010

Appears in sequences

• Number of bracelets of length n using exactly two different colored beads.at n=19A056342
• Numbers which can be expressed as the product of a number and its reversal in at least two different ways.at n=20A066531
• Numbers k such that 1*k + 1, 3*k + 1, 9*k + 1, 27*k + 1 are all primes.at n=25A112041
• Numbers k such that 1*k + 1, 3*k + 1, 9*k + 1, 27*k + 1, 81*k + 1 are all primes.at n=7A112042
• Absolute value of second differences of A005849.at n=6A128194
• Numbers k such that the sum of the Carmichael lambda functions of the divisors is a proper divisor of k.at n=19A131492
• Ten times hexagonal numbers: 10*n*(2*n-1).at n=37A144560
• Numbers n such that n^2048 + (n+1)^2048 is prime.at n=26A274235
• Numbers k with the property that there exists a positive integer multiplier M such that M times the sum of the digits of k, multiplied further by the reversal of this product, gives k.at n=33A305131