Sequences

Duplicate of A036900.

Sum of the integer part of 4th roots of integers <= n.

Sum of the integer part of 5th roots of positive integers less than or equal to n.

Sum of the integer part of 3/2-th roots of integers less than n.

Sum of the integer part of 5/2-th roots of integers less than or equal to n.

Sum of the integer part of 7/2-th roots of integers less than n.

Sum of the integer part of 9/2-th roots of integers less than n.

Sum of the integer part of 10/3-th roots of integers less than n.

Sum of the integer part of 11/3-th roots of integers less than n.

Sum of the integer part of 13/3-th roots of integers less than n.

Sum of the integer part of 14/3-th roots of integers less than n.

Number of point symmetric solutions to non-attacking queens problem on n X n board.

Index of first occurrence of n as a term in A001203, the continued fraction for Pi.

Arrange digits of primes in ascending order (omitting any that contain 0's), sort list, remove duplicates.

Floor( 7*n^2/2 ).

a(n) = floor(5*n^2/2).

Concentric pentagonal numbers: floor( 5*n^2 / 4 ).

Concentric hexagonal numbers: floor(3*n^2/2).

All the primes inside the record 3 X 3 matrix for the Gordon Lee problem: this is [ 113, 754, 937 ].

The 20 primes inside the 4 X 4 matrix with all the rows, columns and major diagonals being reversible non-palindromic and distinct primes (the smallest prime-magical square): [ 1933, 1283, 9551, 3719 ].

An inventory sequence: triangle read by rows, where T(n, k), 0 <= k <= n, records the number of k's thus far in the flattened sequence.

Integer part of decimal 'base-2 looking' numbers divided by their actual base-2 values (denominator of a(n) is n, numerator is n written in binary but read in decimal).

Numbers that, when expressed in base 2 and then interpreted in base 10, yield a multiple of the original number.

Quotient of 'base-2' division described in A032533.

Odd numbers that, when expressed in base 2 and then interpreted in base 10, yield a multiple of the original number.

Integer part of decimal 'base-3 looking' numbers divided by their actual base-3 values.

Numbers that, when expressed in base 3 and then interpreted in base 10, yield a multiple of the original number.

Quotient of 'base-3' division described in A032537.

Integer part of decimal 'base-4 looking' numbers divided by their actual base-4 values.

Numbers that, when expressed in base 4 and then interpreted in base 10, yield a multiple of the original number.

Quotient of 'base-4' division described in A032540.

Integer part of decimal 'base-5 looking' numbers divided by their actual base-5 values.

Numbers that, when expressed in base 5 and then interpreted in base 10, yield a multiple of the original number.

Quotient of 'base-5' division described in A032543.

Integer part of decimal 'base-6 looking' numbers divided by their actual base-6 values, rounded down.

Numbers that, when expressed in base 6 and then interpreted in base 10, yield a multiple of the original number.

Quotient of 'base-6' division described in A032546.

Integer part of decimal 'base-7 looking' numbers divided by their actual base-7 values.

Numbers that, when expressed in base 7 and then interpreted in base 10, yield a multiple of the original number.

Quotient of 'base-7' division described in A032549.

Numbers that, when expressed in base 8 and then interpreted in base 10, yield a multiple of the original number.

Quotient of 'base-8' division described in A032551.

Arrange digits of cubes in ascending order.

Arrange digits of cubes in descending order.

Numbers k whose decimal representation, read as a base-12 value and divided by k, yields an integer.

Quotient of 'base-12' division described in A032555.

Numbers k whose decimal representation, read as a base-13 value and divided by k, yields an integer.

Quotient of 'base-13' division described in A032557.

Numbers k whose decimal representation, read as a base-14 value and divided by k, yields an integer.

Quotient of 'base-14' division described in A032559.