tri-perfect numbers: A005820
triangle of x+y, etc.: see entries under: table of ...
triangle, coloring a: see coloring a triangle
triangle: graphs by numbers of nodes and edges: A008406
Triangles, A006066 , A006947 , A007237
triangles, by perimeter: A005044 *
triangular arrays of integers , see under: table (or triangle) of numbers
triangular arrays of integers, enumeration of special: A003402 , A003403
triangular arrays, indexing: see T-coordinates for arrays
triangular arrays, indexing: see also a073189.txt
triangular lattice: see A2 lattice
triangular numbers, A000217 *, A005448 * (centered)
triangular numbers, partitions into: A007294 *
triangular numbers, sums of three: A002097 , A053604
triangular numbers, sums of two: A051533 *, A053603 *, A051611
triangular numbers: see also EYPHEKA!
triangular numbers: see also A002636 , A007438 , A007437 , A002817
triangular square numbers: A001110 *, A001109
triangular triples: A005044 , A002620
triangulations (1): A000103 A000109 A000256 A001683 A002709 A002710 A002711 A002712 A002713 A003122 A003123 A003446
triangulations (2): A004305 A005495 A005497 A005498 A005499 A005500 A005501 A005502 A005503 A005504 A005505 A005506
triangulations (3): A005507 A005508 A005509 A005979 A006078 A006674 A007815 A011556 A019503 A019504 A027610 A028441
triangulations (4): A033961 A036572 A036573 A053440
tribonacci numbers: A000073 A000213 A001590 A003265 A056816 A081172 A145027 A001644
tribulations game, remoteness numbers: A006019
tribulations: A006019 , A006020
tricapped prism: A005919 , A005920
trigonometric functions which either increase or decrease monotonically: A004112 , A016274 , A046946 , A046947 , A046955 , A046956 , A046959 ,
trinomials over GF(2) , sequences related to (start):
trinomials over GF(2), irreducible: A001153 (Mersenne) A002475 A057460 A057461 A057463 A057474 A057476 A057477 A057478 A057479 A057480 A057481 A057482 A057486 A057646 A057774 A073571 A074710 A074743
trinomials over GF(2), primitive: A001153 (Mersenne), A073726 , A073639 , A074743 , A074744
trinv: A002024 *, see also A002262 , A048645
triperfect numbers: A005820
triple factorial numbers: A007661
triples of relatively prime numbers, sequences related to (start):
triples of relatively prime numbers: A071778 *, A100448 , A100450
triply perfect numbers: A005820
trivalent graphs, see graphs, trivalent
truncatable primes sequences related to (start):
truncatable primes (1): A003459 A020994 A023107 A024770 A024785 A050986 A050987 A052023 A052024 A052025 A055521 A060825
truncatable primes (2): A076586 A076623 A078604 A085248 A085733 A086673 A086697 A094335 A101115 A103443 A103463 A103483
truncatable primes (3): A125590 A127698 A127889 A127890 A127891 A127892 A129669 A129670 A129671 A129672 A129673 A129692
truncatable primes (4): A129693 A129940 A129941 A129942 A129943 A129944 A129945 A132394 A133757 A133758 A137812 A144714
truncated polytopes, sequences related to (start):
truncated cube: A005911 , A005912
truncated octahedron: A005910 * A038170 A038171 A038180 A038181 A038386 A039741 A057112 A060135
truncated square numbers: A005892
truncated tetrahedron: A005905 , A005906 *, A038168 , A038169