Turing machines , sequences related to (start):
Turing machines which halt: A004147 *
Turing machines: A052200 , A079365
Turing machines: see also Busy Beaver problem
Turkish: A057435
Turkish: see also Index entries for sequences related to number of letters in n
twin primes conjecture: see also A093483
twin primes constant: A065645 (continued fraction), A005597 (decimal expansion), A065646 (denominators of convergents to twin prime constant), A065647 (numerators), A062270 , A062271 ; A065421 (sum of reciprocals of twin primes)
twin primes, sequences related to (start):
twin primes: see also primes, twin
two consecutive residues: A000236
two-way infinite sequences sequences related to (start):
two-way infinite sequences (01): Many sequences can be extended backwards in a natural way. For example, the Fibonacci numbers (A000045 ) extend backards to give the two-way infinite sequence
two-way infinite sequences (02): ..., -21, 13, -8, 5, -3, 2, -1, 1, 0, 1, 1, 2, 3, 5, 8, 13, 21, ..., satisfying F(n) = F(n-1) + F(n-2) = -(-1)^n F(-n) for all n. The backwards portion here is the same sequence but with signs, which is quite common, but in general a different sequence is obtained.
two-way infinite sequences (03): The following is a list of two-way infinite sequences. A pair in parentheses indicates that the backwards and forwards sequences are different. This entry is based on communications from Michael Somos.
two-way infinite sequences (04): A000032 A000045 A000096 A000217 A000290 A000292 A000330 A000330 A000447 A001075 A001108 A001109
two-way infinite sequences (05): A001541 A001570 A001653 A001654 A001687 A001840 A001844 A001871 A001906 A002315 A002492 A002530
two-way infinite sequences (06): A002620 A003499 A004524 A004525 A005044 A005248 A005686 A005900 A006221 A006368 A006368 A006369
two-way infinite sequences (07): A006498 A006720 A006721 A006722 A006723 A006723 A006769 A007531 A007598 A007980 A008500 A008616
two-way infinite sequences (08): A008669 A008805 A011655 A011783 A014125 A014523 A014696 A027468 A028242 A029011 A029153 A029177
two-way infinite sequences (09): A029341 A030267 A030451 A035007 A039959 A047273 A047588 A048736 A051111 A051263 A054318 A056925
two-way infinite sequences (10): A058232 A059029 A059502 A060544 A063208 A064268 A065113 A074061 A075839 A077982 A078495 A078529
two-way infinite sequences (11): A080891 A081555 A082290 A082291 A083039 A083040 A083043 A084964 A089498 A092695 A092886 A093178
two-way infinite sequences (12): A096386 A099270 A102276 A103221 A105371
two-way infinite sequences (13): (A000326 , A005449 ) (A000384 , A014105 ) (A001652 , A046090 ) (A002316 , A002317 ) (A002411 , A006002 ) (A003269 , A017817 )
two-way infinite sequences (14): (A029578 , A065423 ) (A048739 , A077921 ) (A051792 , A053602 ) (A070893 , A082289 ) (A105426 , A144479 )
two-way splittings of integers: A000028 , A000379
two-way splittings of integers: see also Beatty sequences
twopins positions: A005682 A005683 A005684 A005685 A005686 A005687 A005688 A005689 A005690 A005691