rabbits, dying: A000044 A023434 A023435 A023436 A023437 A023438 A023439 A023440 A023441 A023442
rabbits: A000045 *
rad(n): A007947
RADD sequences (Reverse then add something): see the web page Sequences of RADD type
Radon function: see Hurwitz-Radon numbers
Radon theorem: A002661
Ramanujan approximation: A000691
Ramanujan numbers tau(n): A000594 *, A007659
Ramanujan's Lost Notebook: (1) A000025 A006304 A006305 A006306 A007325 A050203 A053250 A053251 A053252 A053253 A053254 A053255
Ramanujan's Lost Notebook: (2) A053256 A053257 A053258 A053259 A053260 A053261 A053262 A053263 A053264 A053265 A053266 A053267
Ramanujan's Lost Notebook: (3) A053268 A053269 A053270 A053271 A053272 A053273 A053274 A053281 A053282 A053283 A053284 A055101
Ramanujan's Lost Notebook: (4) A055102 A055103 A055104
Ramsey numbers: A000789 A000791 * A003323 A004401 A006474 A006672 A120414 * A059442
random numbers: see also pseudo-random sequences
random numbers: see random sequences
random sequences: A079365 , A002205
Raney numbers: A062993 , A079508
rapidly growing sequences: see: sequences which grow too rapidly to have their own entries
rational numbers: see the separate Index to Fractions
Rational points on curves:: A005527 , A005523 , A005525 , A005526
rationals, enumerating: A002487 (n)/A002487 (n+1)*, A038566 */A038567 *, A038568 */A038569 *, A020650 */A020651 *, A020652 */A020653 *
RATS: Reverse Add Then Sort: A004000 *, A036839 , A066710 , A066711 , A066713
RATS: see also RADD sequences
Raymond strings: A005303 , A005304 , A005305 , A005306