Sequences

Duplicate of A028505.

Number of primes less than 1000n.

Number of primes less than 10000n.

Number of primes less than 100000n.

Number of primes less than n*10^6.

Number of primes less than n*10^7.

Number of primes less than n*10^8.

Number of primes less than n*10^9.

Number of primes less than n*10^10.

Number of primes less than n*10^11.

Number of primes less than n*10^12.

Number of primes between 100n and 100n+99.

Number of primes between n*1000 and (n+1)*1000.

Number of primes between n*10000 and (n+1)*10000.

Number of primes between n*100000 and (n+1)*100000.

Number of primes between n*10^6 and (n+1)*10^6.

Number of primes between n*10^7 and (n+1)*10^7.

Number of primes between n*10^8 and (n+1)*10^8.

Number of primes between n*10^9 and (n+1)*10^9.

Number of primes between n*10^10 and (n+1)*10^10.

Number of primes between n*10^11 and (n+1)*10^11.

Number of primes between n*10^12 and (n+1)*10^12.

3^n-th prime.

Past of komet 'k2' (A038807).

Partial sums of A008443.

Convolution of Catalan numbers {1,2,5,14,...} with A002802 (5-fold convoluted central binomial coefficients).

Solutions to HAKMEM Problem 45.

Numbers that are divisible by the square of an odd prime.

In A038837 but not A038838.

Cubes that are concatenations of primes.

Concatenation of prime factors of n is a cube.

Primes which when converted to base 36 make single letters or English words.

Unitary superperfect numbers: numbers n such that usigma(usigma(n)) = 2*n, where usigma(n) is the sum of unitary divisors of n (A034448).

Numbers k for which 6*k+1 divides 2^k-1.

3-fold convolution of A000302 (powers of 4).

4-fold convolution of A000302 (powers of 4); expansion of g.f. 1/(1-4*x)^4.

Odd numbers that are differences between two positive cubes.

Even numbers that are differences between two cubes in at least one way.

Multiples of 4 that are the difference of two positive cubes.

Multiples of 8 that are the difference of two positive cubes.

Divisible by 3 (and 9) and are differences between two cubes in at least one way.

Numbers that are divisible by 6 (and 18) and are differences between two cubes in at least one way.

Numbers that are divisible by 5 and are the difference between two (different positive) cubes in at least one way.

Numbers that are divisible by 10 and are differences between two cubes in at least one way.

Numbers that are divisible by 7 and are differences between two cubes in at least one way.

Numbers ending with '1' that are the difference of two positive cubes.

Numbers ending with '2' that are the difference of two positive cubes.

Numbers ending with '3' that are the difference of two positive cubes.

Numbers ending with '4' that are the difference of two positive cubes.

Numbers ending with '5' that are the difference of two positive cubes.