arborescences: A003120
arc-cotangent reducible numbers: A002312
arccos(x): see Pi/2-arcsin(x), A055786 / A002595
arccosec(x): see arcsin(1/x), A055786 / A002595
arccosech(x): see arcsinh(1/x), A055786 / A002595
arccosh(x): A052468 /A052469
arcos and arccos are both used in the database!
arcosh and arccosh are both used in the database!
arcsec(x): see Pi/2-arcsin(1/x), A055786 / A002595
arcsech(x): see arccosh(1/x), A052468 / A052469
arcsin(x): A055786 /A002595 , A006228
arcsinh(x): A055786 /A002595
arctangent numbers, triangle of: A008309 *
areas: A005386
ARIBAS: A062916
arithmetic means: A007340
arithmetic numbers: A003601 *, A090944
arithmetic progressions of primes, see primes, in arithmetic progressions
arithmetic progressions with fixed prime signature, see primes, in arithmetic progressions
arithmetic progressions: A003407 , A005115 , A005836 , A005837 , A005838 , A005839
Armstrong numbers, sequences related to (start):
Armstrong numbers: A005188 *
Armstrong numbers: in other bases: A010343 , A010344 , A010345 , A010346 , A010347 , A010348 , A010349 , A010350 , A010351 , A010352 , A010353 , A010354
Armstrong numbers: see also A014576
Aronson's sequence : A005224 *, A080520 (French version)
Aronson's sequence, generalized: A079000
Aronson's sequence, generalized: see also sequences of the a(a(n)) = 2n family
Aronson's sequence, numerical analogues of: ( 1) A000201 A003151 A003605 A004956 A005224 A007378 A010906 A014132 A026351 A045412 A061891 A064437
Aronson's sequence, numerical analogues of: ( 2) A073074 A079000 * A079250 A079251 A079252 A079253 A079254 A079255 A079256 A079257 A079258 A079259
Aronson's sequence, numerical analogues of: ( 3) A079313 A079325 A079351 A079358 A079905 A079946 A079948 A080029 A080030 A080031 A080032 A080033
Aronson's sequence, numerical analogues of: ( 4) A080034 A080036 A080037 A080081 A080199 A080353 A080455 A080456 A080457 A080458 A080460 A080574
Aronson's sequence, numerical analogues of: ( 5) A080578 A080579 A080580 A080588 A080589 A080590 A080591 A080600 A080633 A080637 A080639 A080640
Aronson's sequence, numerical analogues of: ( 6) A080641 A080644 A080645 A080646 A080652 A080653 A080667 A080707 A080708 A080710 A080711 A080712
Aronson's sequence, numerical analogues of: ( 7) A080714 A080720 A080722 A080723 A080724 A080725 A080726 A080727 A080728 A080731 A080745 A080746
Aronson's sequence, numerical analogues of: ( 8) A080752 A080753 A080754 A080759 A080760 A080780 A080900 A080901 A080903 A080904 A080939 A080949
Aronson's sequence, numerical analogues of: ( 9) A081023 A081024 A081260 A081746 A091387 A091388 A091389 A091390 A091391
arrays, indexing: see a073189.txt
arrays, sequences used for indexing: (1) A000194 A002024 A002260 A002262 A003056 A003057 A003059 A004736 A025581 A048760 A053186 A055086
arrays, sequences used for indexing: (2) A055087 A071797 A073188 A073189
arrays: A003169 , A007073 , A007074 , A007072
artiads: A001583 *
Artin's conjecture or constant, sequences related to (start):
Artin's conjecture : A001122
Artin's conjecture, Artin's constants: A005596 * A048296 * A065414 A065417 A066517
Artin's conjecture: see also primes by primitive root
association schemes: A057495 *, A057498 (noncommutative), A057499 (primitive)
asubb: see A121295 , A121296 , A121297 , A121623 and other dungeon sequences, also A122618
asymmetric channel, codes for: A010101
asymmetric sequences: A002842
asymptotic expansions: A001163 A001164 A002073 A002074 A002304 A002305 A002514 A006572 A006953
atomic species: A005226 , A005227 , A007650
atomic weights: A007656 *
audioactive decay: see "say what you see"
autobiographical numbers: A104784 , but see also self-describing numbers
automata, see cellular automata
automorphic numbers , sequences related to (start):
automorphic numbers: (1) A003226 A007185 A016090 A018247 A018248 A033819 A074194 A074250 A074321 A074330 A074332
automorphic numbers: (2) A030984 A030985 A030986 A030987 A030988 A030989 A030990 A030991 A030992 A030993 A030994
automorphic numbers: (3) A030995 A035383 A046883 A046884 A082576
automorphic numbers: see also A045537 , A075154
A_2 lattice: see A2 lattice
A_3 lattice: see f.c.c. lattice
A_4 lattice: see A4 lattice
a_b: see A121295 , A121296 , A121297 , A121623 and other dungeon sequences, also A122618
A_n lattice: coordination sequence for: see A005901 .
A_n sequence, primes in: A111157