Star number

Star number
First four star numbers, by color.
Total no. of termsinfinity
FormulaSn=6n(n−1)+1
First terms1, 13, 37, 73, 121, 181
OEIS index
The Chinese checkers board has 121 holes.

In mathematics, a star number is a centered figurate number, a centered hexagram (six-pointed star), such as the Star of David, or the board Chinese checkers is played on. The numbers are also called centered dodecagonal numbers because star numbers are centered polygonal numbers with a twelve-sided shape.

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The nth star number is given by the formula Sn = 6n(n − 1) + 1. The first 45 star numbers are 1, 13, 37, 73, 121, 181, 253, 337, 433, 541, 661, 793, 937, 1093, 1261, 1441, 1633, 1837, 2053, 2281, 2521, 2773, 3037, 3313, 3601, 3901, 4213, 4537, 4873, 5221, 5581, 5953, 6337, 6733, 7141, 7561, 7993, 8437, 8893, 9361, 9841, 10333, 10837, 11353, and 11881. (sequence A003154 in the OEIS)

The digital root of a star number is always 1 or 4, and progresses in the sequence 1, 4, 1. The last two digits of a star number in base 10 are always 01, 13, 21, 33, 37, 41, 53, 61, 73, 81, or 93.

Unique among the star numbers is 35113, since its prime factors (i.e., 13, 37 and 73) are also consecutive star numbers.

Relationships to other kinds of numbers

Proof without words that the n-th star number is 12 times the (n−1)-th triangular number, plus one

Geometrically, the nth star number is made up of a central point and 12 copies of the (n−1)th triangular number — making it numerically equal to the nth centered dodecagonal number, but differently arranged. As such, the formula the nth star number can be written as Sn = 1 + 12Tn−1 where Tn = ⁠n (n + 1)/2⁠.

Infinitely many star numbers are also triangular numbers, the first four being S1 = 1 = T1, S7 = 253 = T22, S91 = 49141 = T313, and S1261 = 9533161 = T4366(sequence A156712 in the OEIS).

Infinitely many star numbers are also square numbers, the first four being S1 = 12, S5 = 121 = 112, S45 = 11881 = 1092, and S441 = 1164241 = 10792 (sequence A054318 in the OEIS), for square stars (sequence A006061 in the OEIS).

A star prime is a star number that is prime. The first few star primes are 13, 37, 73, 181, 337, 433, 541, 661, 937 ...(sequence A083577 in the OEIS)

A superstar prime is a star prime whose prime index is also a star number. The first two such numbers are 661 and 1750255921.

A reverse superstar prime is a star number whose index is a star prime. The first few such numbers are 937, 7993, 31537, 195481, 679393, 1122337, 1752841, 2617561, 5262193.

The term "star number" or "stellate number" is occasionally used to refer to octagonal numbers.

Other properties

The harmonic series of unit fractions with the star numbers as denominators is: ∑n=1∞1Sn=1+113+137+173+1121+1181+1253+1337+⋯=π23tan⁡(π23)≈1.159173.

The alternating series of unit fractions with the star numbers as denominators is: ∑n=1∞(−1)n−11Sn=1−113+137−173+1121−1181+1253−1337+⋯≈0.941419.

See also

References

  1. 1 2 3 4 5 Weisstein, Eric W. "Star Number". mathworld.wolfram.com MathWorld. Wolfram Research, Inc. Retrieved 2026-09-25.
  2. 1 2 3 Sparavigna, Amelia Carolina (2019-09-05). "Groupoid of OEIS A003154 Numbers (star numbers or centered dodecagonal numbers)" (PDF). Department of Applied Science and Technology, Politecnico di Torino, Italy: Zenodo. doi:10.5281/zenodo.3386927.
  3. ↑ Somanath, Manju; Kannan, J.; Raja, K.; Sangeetha, V. (August 2017). "Solutions of Pell's Equation Involving Star Primes" (PDF). International Journal of Engineering, Science and Mathematics. 6 (4). ISSN 2320-0294. Retrieved 2026-09-25.
  4. ↑ Sloane, N. J. A. (ed.). "Sequence A000567". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.