[seqfan] Re: A180268

Richard Mathar mathar at strw.leidenuniv.nl
Mon Aug 23 23:07:51 CEST 2010


kb> %S A180268 988,1612,3172,5332,7852
kb> %N A180268 Numbers n with property that A000203(n)-n-1 is a prime number 
kb> and 2*n+1-A000203(n) is a prime number.
kb> Utterly wrong or some additional condition is missing. I get

This should be something like (found be looking at other contemporary
submissions of the author):

%N A180268 Numbers n>10, not multiples of 6, such that A000203(n)-n-1 and 2*n+1-A000203(n) are prime numbers.

More information about the SeqFan mailing list