1,1

A090330(a(n))>0; complement of A090332; A090331(a(n))>1;

even numbers >2 belong to this sequence.

Divisors >1 of 51: {3,17,51}, in binary: {11, 10001, 110011}, as '11' is a prefix of '110011' 51 is a term.

Table of n, a(n) for n=1..68.

Sequence in context: A228358 A134331 A276040 * A272601 A322368 A078941

Adjacent sequences: A090331 A090332 A090333 * A090335 A090336 A090337

nonn

Reinhard Zumkeller, Nov 26 2003

approved