Wikifunctions:OEIS

See https://oeis.org/

Core sequences

A number	Object
A000001	Z
A000002	nth number in Kolakoski sequence (Z15092)
A000004	zero function (Z13640)
A000005	number of divisors (Z13760)
A000007	characteristic function of 0 (Z13829)
A000009	Z
A000010	Euler totient function (Z13955)
A000012	all 1's sequence (Z13827)
A000014	Z
A000019	Z
A000027	natural number identity (Z13636)
A000029	Z
A000031	Z
A000032	nth Lucas number (Z13952)
A000035	n mod 2 (Z13825)
A000040	nth prime (Z15362)
A000041	Z
A000043	nth Mersenne exponent (Z13932)
A000045	nth Fibonacci number (Z13835)
A000048	Z
A000055	Z
A000058	Sylvester's sequence nth term (Z13843)
A000069	Z
A000079	2^n (Z13644)
A000081	Z
A000085	Z
A000088	Z
A000105	Z
A000108	Catalan number (Z13857)
A000109	Z
A000110	Z
A000111	Z
A000112	Z
A000120	binary weight of n (Z13860)
A000123	Z
A000124	Z
A000129	Z
A000140	Z
A000142	factorial (Z13667)
A000161	Z
A000166	Z
A000169	n^(n-1) (Z13959)
A000182	Z
A000203	sum of divisors (Z13770)
A000204	nth Lucas number (Z13952)
A000217	triangular number (Z13961)
A000219	Z
A000225	2^n-1 (Z13948)
A000244	3^n (Z13963)
A000262	Z
A000272	n^(n-2) (Z13965)
A000273	Z
A000290	n^2 (Z13663)
A000292	tetrahedral number (Z13967)
A000302	4^n (Z13969)
A000311	Z
A000312	n^n (Z13809)
A000326	pentagonal number (Z13971)
A000330	square pyramidal number (Z13973)
A000364	Z
A000396	nth perfect number (Z13975)
A000521	Z
A000578	n^3 (Z13977)
A000583	n^4 (Z13979)
A000593	sum of odd divisors (Z13984)
A000602	Z
A000609	Z
A000612	Z
A000670	Z
A000688	Z
A000720	number of primes <= n (Z13986)
A000793	Z
A000796	nth digit of π (Z14166)
A000798	Z
A000959	Z
A000961	Z
A000984	central binomial coefficient (Z13989)
A001003	little Schröder number (Z14883)
A001006	Motzkin number (Z14871)
A001034	Z
A001037	Z
A001045	Jacobsthal number (Z13991)
A001055	Z
A001065	sum of proper divisors (Z13993)
A001097	Z
A001113	nth digit of e (Z15347)
A001147	double factorial of 2n-1 (Z13997)
A001157	sum of squares of divisors (Z13999)
A001190	Z
A001221	number of unique prime divisors (Z13767)
A001222	number of prime divisors (Z13764)
A001227	number of odd divisors (Z14001)
A001285	1-2 Thue-Morse sequence (Z14005)
A001333	Z
A001349	Z
A001358	Z
A001405	binomial(n, floor(n/2)) (Z14007)
A001462	Z
A001477	natural number identity (Z13636)
A001481	Z
A001511	Z
A001519	Z
A001615	Dedekind psi function (Z13957)
A001699	Z
A001700	Z
A001764	Z
A001906	Z
A001969	Z
A002033	Z
A002083	Z
A002106	Z
A002110	primorial p(n)# (Z15287)
A002113	Z
A002275	Z
A002322	Z
A002378	pronic number P_n (Z15037)
A002426	Z
A002487	Z
A002530	Z
A002531	Z
A002572	Z
A002620	quarter-square (Z15113)
A002654	Z
A002658	Z
A002808	Z
A003094	Z
A003136	Z
A003418	Z
A003484	Hurwitz-Radon number (Z15119)
A004011	Z
A004018	Z
A004526	floor(n/2) (Z15111)
A005036	Z
A005100	Z
A005101	Z
A005117	Z
A005130	Z
A005230	Z
A005408	2*n+1 (Z15108)
A005470	Z
A005588	Z
A005811	Z
A005843	double (Z15107)
A006318	Z
A006530	largest prime divisor (Z13735)
A006882	double factorial, python (Z13996)
A006894	Z
A006966	Z
A007318	Z
A008277	Z
A008279	Z
A008292	Z
A010060	Thue-Morse sequence (Z14003)
A018252	Z
A020639	smallest prime divisor (Z13732)
A020652	Z
A020653	Z
A025487	Z
A027642	Z
A038566	Z
A038567	Z
A038568	Z
A038569	Z
A055512	Z
A070939	length of binary representation (Z13928)
A074206	Z
A104725	Z
A217831	Z
A226898	Hooley's delta function (Z14917)
A246655	Z

Others

A number	Object
A000265	odd part (Z13982)
A001348	nth Mersenne prime (Z13950)
A001414	sum of prime divisors (Z13773)
A006370	Collatz conjecture function (Z13561)
A008472	sum of unique prime divisors (Z13776)
A052126	n/(largest prime dividing n) (Z13745)