World!OfNumbers |
WON plate 80 | |
||
---|---|---|---|

Some curious polygonals The 44^{th} enneagonal (9-sided polygonal) number is 6666 !(Sloane's A028992) The 26 ^{th} decagonal (10-sided polygonal) number is 2626 !(Sloane's A001107) The 74 ^{th} heptagonal (7-sided polygonal : n[5n-3]) number is 13579(Sloane's A014637), a number with its odd digits in ascending order ! Variations on the theme :
%N n^2 has digits in ascending order. under A028819
%N Squares with digits in ascending order. under A028820 %N n^2 has digits in descending order. under A028821 %N Squares with digits in descending order. under A028822 %N Primes with digits in ascending order. under A028864 %N Primes with digits in descending order. under A028867 %N Primes that when squared gives numbers with digits in ascending order. under A028865 %N Primes that when squared gives numbers with digits in descending order. under A028868 %N Squares of primes with digits in ascending order. under A028866 %N Squares of primes with digits in descending order. under A028869 | |||

A000080 Prime Curios! Prime Puzzle Wikipedia 80 Le Nombre 80 Numberland 80 |

[ TOP OF PAGE]