Sequences

Sort digits of primes into descending order (A028906) then sort this sequence into ascending order.

Sort digits of primes into descending order (A028906), sort this sequence into ascending order (A028911), then remove duplicates.

First differences of A007952.

Divide A028913 by 2.

Take next group of 3 primes, beginning at 7, map final digits to base 4 by 1->0, 3->1, 7->3, 9->2; convert back to decimal.

Friedlander-Iwaniec primes: Primes of form a^2 + b^4.

a(n) = (3*n+1)! / (24*n).

(3n+1)!/(4*(3n-1)).

Congruent to 0, 6, 10, 12 (mod 14).

Pit harvesting sequence for winning solitaire Tchoukaillon (or Mancala).

Determinant of n-dimensional laminated lattice Lambda(n) (non-integral beyond the entries shown).

Determinant of n-dimensional lattice Kappa(n) (non-integral beyond the entries shown).

Kissing number of n-dimensional lattice Kappa_n.

Maximal number of pairs of minimal vectors in n-dimensional laminated lattice.

Maximal number of pairs of minimal vectors in an n-dimensional lattice.

Number of pairs of minimal vectors in n-dimensional lattice Kappa_n.

Numbers represented by quadratic form with Gram matrix [ 3, 1; 1, 5 ].

Theta series of quadratic form (or lattice) with Gram matrix [ 3, 1; 1, 5 ].

Numbers represented by quadratic form with Gram matrix [ 4, 1; 1, 6 ], divided by 2.

Theta series of quadratic form (or lattice) with Gram matrix [ 4, 1; 1, 6 ].

Strings giving winning positions in Tchoukaillon (or Mancala) solitaire.

Triangular array of winning positions in Tchoukaillon (or Mancala) solitaire.

Table of winning positions in Tchoukaillon (or Mancala) solitaire.

Negative of numerator of y-coordinate of (2n+1)*P where P is the generator for rational points on the curve y^2 + y = x^3 - x.

a(n) = A006720(n)^3 (cubed terms of Somos-4 sequence).

Numerator of x-coordinate of (2n)*P where P is the generator for rational points on the curve y^2 + y = x^3 - x.

Denominator of x-coordinate of (2n)*P where P = (0,0) is the generator for rational points on the curve y^2 + y = x^3 - x.

Negative of numerator of y-coordinate of (2n)*P where P is generator for rational points on curve y^2 + y = x^3 - x.

a(n) = denominator of y-coordinate of (2n)*P where P is the generator for rational points on the curve y^2 + y = x^3 - x.

a(n) = numerator of the X-coordinate of n*P where P is the generator [0,0] for rational points on the curve y^2 + y = x^3 - x.

Denominator of X-coordinate of n*P where P is the generator [0,0] for rational points on curve y^2+y = x^3-x.

Negative of numerator of y coordinate of n*P where P is the generator [0,0] for rational points on curve y^2+y = x^3-x.

Denominator of y coordinate of n*P where P is the generator [0,0] for rational points on curve y^2+y = x^3-x.

Numerator of x-coordinate of (2n+1)*P where P is the generator for rational points on the curve y^2 + y = x^3 - x.

a(n) = A006720(n)^2 (squared terms of Somos-4 sequence).

Maximal cardinality of 2-distance set in R^n with distance ratio tau.

Difference between P(n) and nearest integer to P(n-1)^2 / P(n-2), where P(i) =i-th prime.

An "extremely strange sequence": a(n+1) = [ A*a(n)+B ]/p^r, where p^r is the highest power of p dividing [ A*a(n)+B ] and p=2, A=4.001, B=1.2.

Write numbers from 1 to n(n+1)/2 in a left-justified lower triangular array (a) downwards and (b) across; a(n) is number of numbers in same position in both.

Minimal norm of n-dimensional, strictly odd, unimodular lattice.

Numbers represented by quadratic form with Gram matrix [ 2, 1; 1, 4 ] (or the Kleinian 2-d lattice, see A002652).

Numbers represented by quadratic form with Gram matrix [ 3, 1; 1, 4 ].

Theta series of quadratic form (or lattice) with Gram matrix [ 3, 1; 1, 4 ].

Numbers represented by quadratic form with Gram matrix [ 2, 1; 1, 6 ]. (divided by 2).

Numbers represented by quadratic form with Gram matrix [ 4, 1; 1, 4 ] (divided by 2).

Theta series of quadratic form (or lattice) with Gram matrix [ 4, 1; 1, 4 ].

Numbers represented by quadratic form with Gram matrix [ 2, 1; 1, 8 ] (divided by 2).

Numbers represented by quadratic form with Gram matrix [ 2, 1; 1, 12 ] (divided by 2).

Theta series of quadratic form with Gram matrix [ 2, 1; 1, 12 ].

Numbers represented by quadratic form with Gram matrix [ 3, 1; 1, 8 ].