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Siegel modular forms or modular group, Poincare series for: A006476 A027633 A027634 A027672 A029143 A051629 A051630

Siegel modular group, order of: A027638 A027639

Sierpinski gasket: see Sierpinski triangle

Sierpinski numbers problem: A040076* A050921* A050412 A052333 A040081 A038699 A033919 A046067 A046068 A014566

Sierpinski triangle: A047999, A001316

Sierpinski triangle, graph: Graph of sequence looks like a (possibly transformed) Sierpinski triangle: A280172, A213541, A295989

Sierpinsky: the preferred spelling in the OEIS is Sierpinski (not Sierpiński, because it contains the non-ASCII character ń)

sieve, badly sieved numbers: A066680, A066681

sieve, binary: A007950*

sieve, Eratosthenes: A000040, A004280, A038179, A083140, A083221, A099361

sieve, even: A056533

sieve, Fibonacci: A039672*

sieve, Flavius Josephus: see Josephus Problem

sieve, generated by a: A002491 A003309 A003310 A003311 A006508 A045954 A119485 A119486

sieve, golden, A099267

sieve, Ludic numbers: A003309*, A255407, A255127, A260717

sieve, Madore's: A100002

sieve, multilevel: A005209*

sieve, Sierpinski: A047999*, A051679

sieve, Smarandache: A007952*, A028920, A048859

sieve, spiral: A005620 A005621 A005622 A005623 A005624 A005625 A005626

sieve, square: A002960*

sieve, ternary: A007951*

sigma(n) = sum of divisors of n: A000203* (also called sigma_1(n))

sigma(n): records: A034885, A002093, A007626

sigma(n): see also sums of divisors

sigma(n): see also A002191, A002192, A004394, A051444, A090128

sigma_0(n): A000005 (number of divisors of n)

sigma_1(n): A000203 (sum of divisors of n)

sigma_k(n), the sum of the k-th powers of the divisors of n: for k= 0,...,9: A000005, A000203, A001157, A001158, A001159, A001160, A013954, A013955, A013956, A013957

sigma_k(n), the sum of the k-th powers of the divisors of n: for k=10,...,19: A013958, A013959, A013960, A013961, A013962, A013963, A013964, A013965, A013966, A013967

sigma_k(n), the sum of the k-th powers of the divisors of n: for k=20,...,25: A013968, A013969, A013970, A013971, A013972, A281959

signature sequences (1): A023123 (e), A023124 (1/e), A023125 (e^2), A023126 (1/e^2), A023129 (sqrt e), A023130 (1/sqrt e)

signature sequences (2): A023133 (Pi), A023134 (1/Pi), A035796, A373211 (Pi^2), A373215 (Pi/2)

signature sequences golden ratio: A084531 (phi), A084532 (1/phi), A118276 (phi^2), A167970 (1/phi^2), A167971 (phi^3), A167979 (1/phi^3), A167972 (phi^4), A167968 (1/phi^4), A167973 (phi^5), A167967 (1/phi^5), A167974 (phi^6), A167966 (1/phi^6), A167975 (phi^7), A167965 (1/phi^7), A167976 (phi^8), A167964 (1/phi^8)

signature sequences logarithms: A373212 (log 2), A373214 (log 3), A191475 (log 3/log 2), A191476 (log 2 /log 3)

signature sequences sqrt: A007336 (2) A023115 (1/2) A007337 (3) A023116 (1/3) A023117 (5) A023118 (1/5) A023121 (2/3) A023122 (3/2) A023127 (6) A023128 (1/6) A023119 (7) A023120 (1/7) A023131 (8) A023132 (1/8)

signature: see also prime signature
silver mean, 1+sqrt(2): A014176*, A007395
silver number: A060006, A072117
Silverman's sequence: A001462
simple cubic lattice: see cubic lattice
simple groups: see groups, simple

simplex, barycentric subdivision of: A002050*

simplices in a cube: A124505, A108973

Simplices:: A002050, A004145, A005461, A005462, A005463, A005464

simplicial arrangements of lines: A003036*

simplicial polyhedra: A000109*

sin(Pi/k):: A010527 (3), A010503 (4), A019845 (5), A020761 (6), A323601 (7), A182168 (8), A019829 (9), A019827 (10), A019824 (12), A232736 (14), A019821 (15), A232738 (16), A241243 (17), A019819 (18), A019818 (20), A019815 (30), A019814 (36), A019813 (45), A019812 (60), A019811 (90), A019810 (180)

sin(x):: A007119, A007118, A001250, A000965, A003712, A006656, A007301, A002017, A003715, A003717, A003705, A003706, A003709, A003722

sinh(x):: A000965, A003724, A006154, A006656, A003704, A003716, A002084, A003722, A002085

siteswaps (or site swaps): see under juggling
Sirag numbers: A196224

• This is a section of the Index to the OEIS®.
• For further information see the main Index to OEIS page.
• Please read Index: Instructions For Updating Index to OEIS before making changes to this page.
• If you did not find what you were looking for in this Index, you can always search the database for a particular word or phrase.
• Full list of sections: