login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A091967 a(n) = n-th term of sequence A_n, or -1 if A_n has fewer than n terms. 6
0, 2, 1, 0, 2, 3, 0, 6, 6, 4, 44, 1, 180, 42, 16, 1096, 7652, 13781, 8, 24000, 119779, 458561, 152116956851941670912, 1054535, -53, 26, 27, 59, 4806078, 2, 35792568, 3010349, 2387010102192469724605148123694256128, 2, 0, -53, 43, 0, -4097, 173, 37338, 111111111111111111111111111111111111111111, 30402457, 413927966 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

This version ignores the offset of A_n and just counts from the beginning of the terms shown in the OEIS entry.

Thus a(8) = 6 because A_8 begins 1,1,2,2,3,4,5,6,... [even though A_8(8) is really 7].

The value a(n) = -1 could arise in two different ways, but it will be easy to decide which. - N. J. A. Sloane, Nov 27 2016

If the sequence were calculated as far as n=91966, the value of a(91967) could be chosen at will. Note that this sequence may change if the initial terms in A_n are altered, which does happen from time to time, usually because of the addition of an initial term. - M. F. Hasler, Sep 22 2013.

After a(47), currently unknown, the sequence continues with a(48) = A48(47) = 1497207322929, a(49) = A49(48) = unknown, a(50) = A50(49) = unknown, a(51) = A51(50) = 1125899906842625, a(52)=97, a(53) = -1 (since A000053 has only 29 terms). - M. F. Hasler, Sep 22 2013

LINKS

M. F. Hasler, Table of n, a(n) for n = 1..46

OEIS, List of finite sequences, sorted by A-number.

N. J. A. Sloane, My favorite integer sequences, in Sequences and their Applications (Proceedings of SETA '98).

EXAMPLE

a(1) = 0 since A000001 has offset 0, and begins with A000001(0) = 0.

a(26) = 26 because the 26th term of A000026 = 26.

CROSSREFS

See A051070, A107357, A102288 for other versions.

Cf. A000001, A000002, A000003, A000004, A000005, A000006, A000007, A000008, A000009, A000010, A000011, A000012, A000013, A000014, A000015, etc.

Sequence in context: A144219 A144027 A019591 * A031135 A037181 A051070

Adjacent sequences:  A091964 A091965 A091966 * A091968 A091969 A091970

KEYWORD

sign,changed

AUTHOR

Proposed by several people, including Jeff Burch and Michael Joseph Halm

EXTENSIONS

Corrected and extended by Jud McCranie. Further extended by N. J. A. Sloane and E. M. Rains Dec 08 1998.

Corrected and extended by N. J. A. Sloane, May 25, 2005

Corrected a(26), a(36) and a(42). - M. F. Hasler, Jan 30 2009

a(43) and a(44) added by Daniel Sterman, Nov 27 2016

a(1) corrected by N. J. A. Sloane, Nov 27 2016 at the suggestion of Daniel Sterman.

Definition and comments changed by N. J. A. Sloane, Nov 27 2016

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified December 4 17:40 EST 2016. Contains 278755 sequences.