These are numbers of the form 30*n* + 7. Composite numbers of this form are listed in Sloane’s A227869.

These are numbers of the form 30*n* + 7. Composite numbers of this form are listed in Sloane’s A227869.

is a composer and photographer from Detroit, Michigan. He has been working on a Java program to display certain mathematical diagrams.

is a composer and photographer from Detroit, Michigan. He has been working on a Java program to display certain mathematical diagrams.