Sequences

Concatenation of n and n + 6 or {n,n+6}.

Concatenation of n and n+7.

Concatenation of n and n + 8 or {n,n+8}.

Concatenation of n and n + 9 or {n,n+9}.

a(n) = floor(n/Pi).

a(n) = floor(n^2/Pi).

Numbers k such that k concatenated with k+2 is a prime.

Numbers k such that k concatenated with k+3 is a prime.

Numbers k such that k concatenated with k+4 is a prime.

Numbers k such that k concatenated with k+5 is a prime.

Numbers k such that k concatenated with k+6 is a prime.

Numbers k such that k concatenated with k+7 is a prime.

Numbers k such that k concatenated with k+8 is a prime.

Numbers k such that k concatenated with k+9 is a prime.

Primes that are concatenations of n with n + 2.

Primes that are concatenations of n with n + 3.

Primes that are concatenations of k with k + 4.

Primes that are concatenations of n with n + 5.

Primes that are concatenations of k with k + 6.

Primes that are concatenations of n with n + 7.

Primes that are concatenations of n with n + 8.

Primes that are decimal concatenations of n with n + 9.

a(n) = floor(n^3 / Pi).

a(n) = floor(n/e).

a(n) = floor(n^2 / e).

a(n) = floor(n^3 / e).

a(n) = floor(Pi^n / e).

a(n) = floor( exp(n) / Pi ).

Lucky numbers indexed by the lucky numbers (Lucky numbers with lucky number subscripts).

Numbers k such that k concatenated with itself is a lucky number.

Numbers k such that k concatenated with k+1 is a lucky number.

Numbers k such that k concatenated with k+2 is a lucky number.

Numbers k such that k concatenated with k+3 is a lucky number.

Numbers k such that k concatenated with k+4 is a lucky number.

Numbers k such that k concatenated with k+5 is a lucky number.

Numbers k such that k concatenated with k+6 is a lucky number.

Numbers k such that k concatenated with k+7 is a lucky number.

Numbers k such that k concatenated with k+8 is a lucky number.

Numbers k such that k concatenated with k+9 is a lucky number.

Lucky numbers that are concatenations of a number k with itself.

Lucky numbers that are decimal concatenations of n with n + 1.

Lucky numbers that are concatenations of n with n + 2.

Lucky numbers that are decimal concatenations of n with n + 3.

Lucky numbers that are concatenations of n with n + 4.

Lucky numbers that are decimal concatenations of n with n + 5.

Lucky numbers that are decimal concatenations of n with n + 6.

Lucky numbers that are decimal concatenations of n with n + 7.

Lucky numbers that are decimal concatenations of n with n + 8.

Lucky numbers that are concatenations of n with n + 9.

a(n) is the smallest positive k such that k concatenated with k + n is a lucky number.