Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
1 together with lesser of twin primes.
Table of n, a(n) for n=1..52.
Sequence in context: A093326 A001359 A096292 * A078864 A208574 A023218
Adjacent sequences: A181744 A181745 A181746 * A181748 A181749 A181750
Juri-Stepan Gerasimov, Nov 08 2010
Definition and terms corrected by R. J. Mathar, Oct 15 2011