1,3
If n is a prime p then a(n)=2^n-p-1. If p=7,a(7)=120.
Sequence in context: A042601 A047168 A084465 this_sequence A092659 A002352 A042647
Adjacent sequences: A056197 A056198 A056199 this_sequence A056201 A056202 A056203
nonn
Labos E. (labos(AT)ana.sote.hu), Aug 02 2000
Search completed in 0.002 seconds