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253 (number)

From Wikipedia, the free encyclopedia

Natural number

253

←250 251 252 253 254 255 256 257 258 259 →

←0 100 200 300 400 500 600 700 800 900 →

two hundred fifty-three

253rd
(two hundred fifty-third)

11 × 23

1, 11, 23, 253

ΣΝΓ´

CCLIII,ccliii

11111101₂

100101₃

1101₆

375₈

191₁₂

FD₁₆

253 (two hundred [and] fifty-three) is thenatural number following252 and preceding254.

In mathematics

253 is:

asemiprime since it is the product of 2 primes.
a brilliant number, meaning that itsprime factors have the same amount of digits^[1]
the 22ndtriangular number.^[2]
astar number.^[3]
acentered heptagonal number.^[4]
acentered nonagonal number.^[5]
aBlum integer.^[6]
a member of the13-aliquot tree.

References

^Sloane, N. J. A. (ed.)."Sequence A078972 (brilliant numbers)".TheOn-Line Encyclopedia of Integer Sequences. OEIS Foundation.
^Sloane, N. J. A. (ed.)."Sequence A000217 (triangular numbers)".TheOn-Line Encyclopedia of Integer Sequences. OEIS Foundation.
^Sloane, N. J. A. (ed.)."Sequence A003154 (Centered 12-gonal numbers. Also star numbers: 6*n*(n-1) + 1)".TheOn-Line Encyclopedia of Integer Sequences. OEIS Foundation.
^Sloane, N. J. A. (ed.)."Sequence A069099 (Centered heptagonal numbers. a(n) = (7*n^2 - 7*n + 2)/2)".TheOn-Line Encyclopedia of Integer Sequences. OEIS Foundation.
^Sloane, N. J. A. (ed.)."Sequence A060544 (Centered 9-gonal numbers. (3n-1)*(3n-2)/2)".TheOn-Line Encyclopedia of Integer Sequences. OEIS Foundation.
^Sloane, N. J. A. (ed.)."Sequence A016105 (Blum integers: numbers of the form p * q where p and q are distinct primes congruent to 3 (mod 4))".TheOn-Line Encyclopedia of Integer Sequences. OEIS Foundation.

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