A090334 Numbers with at least one divisor >1 that is a prefix of another divisor in binary representation.

4, 6, 8, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 26, 27, 28, 30, 32, 34, 36, 38, 39, 40, 42, 44, 45, 46, 48, 50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 66, 68, 70, 72, 74, 75, 76, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90, 92, 93, 94, 95, 96, 98, 99, 100, 102, 104, 105

Offset

1,1

Comments

Complement of A090332.

Even numbers >2 belong to this sequence.

Links

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

Formula

A090330(a(n)) > 0.

A090331(a(n)) > 1.

Example

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

Crossrefs

Cf. A090330, A090331.

Sequence in context: A134331 A276040 A360694 * A272601 A322368 A078941

Adjacent sequences: A090331 A090332 A090333 * A090335 A090336 A090337

Keyword

nonn,base

Author

Reinhard Zumkeller, Nov 26 2003

Status

approved