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# Index to OEIS: Section Ab

# Index to OEIS: Section Ab

- This is a section of the Index to the
**OEIS®**. - For further information see the main
**Index to OEIS**page. - Please read Index: Instructions For Updating Index to OEIS before making changes to this page.
- If you did not find what you were looking for in this Index, you can always search the database for a particular word or phrase.
- Full list of sections:

[ Aa | Ab | Al | Am | Ap | Ar | Ba | Be | Bi | Bl | Bo | Br | Ca | Ce | Ch | Cl | Coa | Coi | Com | Con | Cor | Cu | Cy | Da | De | Di | Do | Ea | Ed | El | Eu | Fa | Fe | Fi | Fo | Fu | Ga | Ge | Go | Gra | Gre | Ha | He | Ho | Ia | In | J | K | La | Lc | Li | Lo | Lu | M | Mag | Map | Mat | Me | Mo | Mu | N | Na | Ne | Ni | No | Nu | O | Pac | Par | Pas | Pea | Per | Ph | Poi | Pol | Pos | Pow | Pra | Pri | Pro | Ps | Qua | Que | Ra | Rea | Rel | Res | Ro | Ru | Sa | Se | Si | Sk | So | Sp | Sq | St | Su | Sw | Ta | Te | Th | To | Tra | Tri | Tu | U | V | Wa | We | Wi | X | Y | Z | 1 | 2 | 3 | 4 ]

- A120498 (numbers C from the
*abc*conjecture), A216323 (b in triples with a=1), A216328 (b in triples with a = 2). - list of "abc-hits": A225426 (the triples), A130510, A130511, A130512 (values of c, a, rad(abc)), A225425 (# "abc-hits" with c < 10^n).
- search for records of the merit function: (admitting only specific C values)
- less specifically related: A007947 (radical), A001220 (Wieferich primes),
- A002587 (largest prime factor of 2^n + 1), A010846 (# smaller numbers with no other prime factors),
- A191100 ([rad(ABC)]/C for A=3, C=A+B), A190846 (same for A=1), A191093 (same for A=2)
- A039678 (
*a*such that*a*^(*p*-1)-1 is divisible by*p*^2), A147803 (m coprime to 5 minimizing A007947(m(5^n-m))), A147804 (m coprime to 7 minimizing A007947(m(7^n-m))), A185103 (Smallest k > 1 such that k^(n-1) == 1 (mod n^2))

- maxima and minima of rad
*(m(n-m)n)*: A147298 (minima), A147300 (m for minima). - p-smooth {n,n+1}: A085152 (p=5), A085153 (p=7), A002071 (# p-smooth pairs)

abelian numbers: A051532

absolute primes: see primes, absolute

abundance: see abundancy

- abundancy: A033880*, A033879, A005579, A005347, A005580, A033881, A033882
- abundancy: see also deficiency
- abundant numbers: A002093, A002182, A005101*, A091191
- abundant numbers: consecutive: A094268
- abundant numbers: odd: A005231*, A006038, A064001
- abundant numbers: see also A004394

- Ackermann function: A001695, A046859, A014221
- Ackermann function: see also sequences which grow too rapidly to have their own entries

acyclic digraphs, see digraphs, acyclic

- additive bases: A004133, A004135, A004136
- additive bases: see also Golomb rulers

##### additive basis, sequences which are an:

- order 1:
- order 2:
- order 3:
- order 4:
- order 5:
- order 6:
- order 7:
- order 8:
- order 9:
- order 10:

- additive sequences (00): definition: a(n*m) = a(n) + a(m) if GCD(n,m) = 1
- additive sequences (01): completely additive A001222, A001414, A007814, A007949, A048675, A056239, A067666, A076649,
- additive sequences (02): completely additive A078458, A078908, A078909, A112765, A113177
- additive sequences (03): A001221, A005063-A005085, A005087-A005091, A005094, A008472, A008474,
- additive sequences (04): A008475, A008476, A046660, A052331, A055631, A056169, A056170, A059841,
- additive sequences (05): A064372, A064415, A066328, A079978, A080256, A081403, A087207, A090885,
- additive sequences (06): A106490, A106492, A113178, A113222, A115357, A121262, A086275
- additive sequences (07): completely additive fractions: A083345/A083346
- additive sequences (08): additive fractions: A028235/A007947, A028236/A000027
- additive sequences (09): totally additive: see additive sequences, completely additive
- additive sequences (10): strongly additive: see additive sequences, completely additive

Aho-Sloane paper: see entry for a(n+1)=a(n)^2 + ...

Airey's converging factor: A001662

Aitken's array: A011971*

- This is a section of the Index to the
**OEIS®**. - For further information see the main
**Index to OEIS**page. - Please read Index: Instructions For Updating Index to OEIS before making changes to this page.
- If you did not find what you were looking for in this Index, you can always search the database for a particular word or phrase.
- Full list of sections:

[ Aa | Ab | Al | Am | Ap | Ar | Ba | Be | Bi | Bl | Bo | Br | Ca | Ce | Ch | Cl | Coa | Coi | Com | Con | Cor | Cu | Cy | Da | De | Di | Do | Ea | Ed | El | Eu | Fa | Fe | Fi | Fo | Fu | Ga | Ge | Go | Gra | Gre | Ha | He | Ho | Ia | In | J | K | La | Lc | Li | Lo | Lu | M | Mag | Map | Mat | Me | Mo | Mu | N | Na | Ne | Ni | No | Nu | O | Pac | Par | Pas | Pea | Per | Ph | Poi | Pol | Pos | Pow | Pra | Pri | Pro | Ps | Qua | Que | Ra | Rea | Rel | Res | Ro | Ru | Sa | Se | Si | Sk | So | Sp | Sq | St | Su | Sw | Ta | Te | Th | To | Tra | Tri | Tu | U | V | Wa | We | Wi | X | Y | Z | 1 | 2 | 3 | 4 ]