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

 

Logo

Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A137440 Triangle T(n,m) read by rows: T(m,n) = (1+n*3^m)-th prime. 0
2, 3, 7, 5, 17, 67, 7, 29, 107, 421, 11, 41, 157, 599, 2153, 13, 53, 199, 769, 2791, 9857, 17, 67, 257, 967, 3469, 12203, 41851, 19, 79, 311, 1151, 4129, 14537, 49697, 167623, 23, 97, 367, 1327, 4817, 16871, 57571, 193957, 645581, 29, 107, 421, 1549, 5521 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row sums are: {2, 10, 89, 564, 2961, 13682, 58831, 237546, 920611, 3459888, 12685349, ...}

The first 3 columns are essentially A000040, A031377 and A031918. - R. J. Mathar, May 05 2008

LINKS

Table of n, a(n) for n=1..50.

EXAMPLE

{2},

{3, 7},

{5, 17, 67},

{7, 29, 107, 421},

{11, 41, 157, 599, 2153},

{13, 53, 199, 769, 2791, 9857},

{17, 67, 257, 967, 3469, 12203, 41851},

{19, 79, 311, 1151, 4129, 14537, 49697, 167623},

{23, 97, 367, 1327, 4817, 16871, 57571, 193957, 645581},

{29, 107, 421, 1549, 5521, 19301, 65699, 220873, 33591, 2412797},

{31, 127, 467, 1741, 6229, 21649, 73867, 247943, 822587, 2702809, 8807899}

MATHEMATICA

T[n_, m_] := Prime[1 + n*3^m]; Table[Table[T[n, m], {m, 0, n}], {n, 0, 10}]; Flatten[%] Table[Apply[Plus, Table[T[n, m], {m, 0, n}]], {n, 0, 10}];

CROSSREFS

Sequence in context: A083188 A228775 A129543 * A294639 A038026 A051860

Adjacent sequences:  A137437 A137438 A137439 * A137441 A137442 A137443

KEYWORD

nonn,tabl

AUTHOR

Roger L. Bagula, Apr 17 2008

EXTENSIONS

Edited by N. J. A. Sloane, May 16 2008

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 November 21 12:43 EST 2017. Contains 295001 sequences.