Siegel modular forms or modular group, Poincare series for: A006476 A027633 A027634 A027672 A029143 A051629 A051630
Siegel modular group, order of: A027638 A027639
Sierpinski numbers problem: A040076 * A050921 * A050412 A052333 A040081 A038699 A033919 A046067 A046068 A014566
Sierpinsky: the preferred spelling in the OEIS is Sierpinski
sieve, sequences generated by a (start):
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: A000960 * A047241 A056530 A056531 A099204 A099207 A099243
sieve, generated by a: A002491 A003309 A003310 A003311 A006508 A045954 A119485 A119486
sieve, golden, A099267
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 A002192 , A051444 , A004394
sigma(n): see also sum of divisors
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,...,24: A013968 , A013969 , A013970 , A013971 , A013972
signature sequences (1): A007336 A007337 A023115 A023116 A023117 A023118 A023119 A023120 A023121 A023122 A023123 A023124
signature sequences (2): A023125 A023126 A023127 A023128 A023129 A023130 A023131 A023132 A023133 A023134 A035796
signature: see also prime signature
silver mean, 1+sqrt(2): A014176 *
silver number: A060006 , A072117
Silverman's sequence: A001462
simple cubic lattice, theta series of: A005875 *
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(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