Heptadecimal

**Heptadecimal**, also known as **Secinary**, **Zotary**, or **Suboptimal**, is a base with 17 digits.

## NumberblocksDude987's Designs

3 has one smaller jester hat spike
5 has a Pentagonal eye and a purple pentagonal amulet/necklace
6 has 1 red dice block
7 has imperfect shaped eyes because he is a prime
8 has square eyebrows and circular eyes with no mask
9 is one grey colour on his body instead of 3
X has one step squad pentagonal eye and is brown
A is like a mix between Alphablock A and Arifmetix's 51
B is like decimal 12 but navy blue and has rectangular glasses
C is like Alphablock C and decimal 13
D is a mix between decimal 14 and Alphablock D
E is a mix between Alphablock E and 15 has two pentagonal eyes but no step squad glasses (yet)
F is just decimal 16 but pink

## STDT87's design

Une-Car: Same.
Kynt: Same as many Kynt designs.
Hex-Quatt: Same.
Seci: Same as 17 but with white blocks and red borders. Her tints are also red.
Binon (Seci-Une): 17 blocks white with red borders, 1 block red. She looks like 11, but with rectangular eyes and eyebrows.
Noci (Seci-Seco): 17 blocks white with red borders, 2 blocks orange. Same as 19, but her eyebrows are more 'zig-zag-ish'.
Bec (Seci-Trip): 17 blocks white with red borders, 3 blocks yellow. He looks like 20, but without his glasses and has rectangle eyes instead.
Triven (Seci-Car): 17 blocks white with red borders, 4 blocks green. She looks like 21, but has no rainbow feathers.
Bel (Seci-Kynt): 17 blocks white with red borders, 5 blocks blue. She is the same as Bel from Hexagesanary.
Eikosia (Seci-Hex): 17 blocks white with red borders, 6 blocks purple/indie/'whatever that color is'. He has Seci-Seco's face.
Boe (Seci-Supta): Looks like my Bec-Car, but Seci blocks white with red borders, and Supta blocks with the first Supta colors of the rainbow.

## PotatoSandwich186's Design

{{Scroll box|text=One 1 - Wears a top hat.

Two 2- Same.

Three 3 - Has a triangle instead of three balls

Four 4 - Same.

Five 5 -Has a pentagon instead of a star and has no glove.

Six 6 -Same.

Sept 7 - Same but is now called Sept.

Eight 8 - is no longer Octoblock but likes octagons.

Eight and a Half 8.8888... - Has an 8.8888... fingered glove.

Nine 9 - Same.

Dek ↊ - Has ↊ (10) brown blocks and two pentagon eyes

Broc B - Has 6 seafoam blocks, 5 orange blocks and she loves Broccoli

Cam C - Has C (12) gray blocks with pink spots and she has a camera.

Door D - Has D (13) burgundy blocks and has a picture of a door on him

Egg E - Has E (14) dark yellow blocks and he is a double lucky chicken!.

Fif F - Has F (15) dark blue blocks and is a nurse.

Hex H - Has H (16) black blocks and is a magician.

Seff 10 - Is like Decimal 10 but has 17 blocks and 2 8.888... fingered gloves.

Sefleven 11 - is like Decimal 11 and Decimal 18

Twel 12 - Twel is a crazy shape maker

Thriteen 13 - Thriteen is a unlucky dancer as in Decimal Thriteen is Twenty.

Fourteen 14 (21) - is a triple lucky step squad she also has 7 triangular badges.

Fivteen 15 (22) - is double B and a businessman.

Sixteen 16 (23) - is happy being them just like zir Decimal counterpart.

Septeen 17 (24) - has a obsession with toothbrushes

Eighteen 18 (25) - is a big square with 5 pentagon eyes.

Nineteen 19 (26) - at day he is a door salesman at night this Heptadeciblock is a secret agent.

Dekteen 1↊ (27) is a super cube.

Brocteen 1B (28) - is a quardruple lucky step squad.

Camteen 1C (29) - is just like Decimal 29.

Doorteen 1D (30) - is obsessed with pop band One Direction.

Eggteen 1E (31) - is just like Decimal 31

Fifteen 1F (32) - is a super rectangle that is often confused with 15 (22).

Hexteen 1H (33) - don't think about calling them fat or they will get really angry.

Tuseff 20 (34) - likes painting like 10 (17) but likes finger-painting the most.

One Seffdred 100 (289) is like Decimal 100 but has 289 blocks}

## Galleries

**Bijective Number Systems:**
Unary (base 1) • Bijective Decimal (base 10) • Bijective Dozenal (base 12)
**Others:**
Baseless (Using a unique symbol to represent every integer)