1,1

a(1) = 15 because 15 = 3 + 5 + 7;

a(2) = 21 because 21 = 3 + 7 + 11.

Adjacent sequences: A127326 A127327 A127328 this_sequence A127330 A127331 A127332

Sequence in context: A020162 A046404 A099610 this_sequence A043326 A079814 A090999

easy,nonn

Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Mar 30 2007