The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A109434 Irregular triangle read by rows: row n contains the numbers from 2^n up to (n+3)*2^(n-2), inclusive, read along their common subdiagonal of A109433. 2
 0, 0, 1, 1, 2, 2, 4, 5, 8, 11, 12, 16, 24, 27, 28, 32, 51, 60, 63, 64, 64, 107, 131, 140, 143, 144, 128, 222, 282, 307, 316, 319, 320, 256, 457, 601, 666, 691, 700, 703, 704, 512, 935, 1270, 1432, 1498, 1523, 1532, 1535, 1536, 1024, 1904, 2665, 3057, 3224, 3290 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 COMMENTS Evolution of 2^n into 2^(n-2)(n+3) as exhibited by A109433. The forward differences of the last row of the table approache A058396. LINKS EXAMPLE Triangle begins    0  0    1  1    2  2    4  5    8 11 12   16 24 27 28   32 51 60 63 64 MATHEMATICA T[n_, m_] := Length[ Select[ StringPosition[ #, ToString[(10^m - 1)/9]] & /@ Table[ ToString[ FromDigits[ IntegerDigits[i, 2]]], {i, 2^n, 2^(n + 1) - 1}], # != {} &]]; Join[{0, 0, 1, 1, 2}, Flatten[ Table[ T[n + i, i], {n, 0, 9}, {i, n + 1}]]] CROSSREFS Cf. A109433, A109436. Sequence in context: A206138 A241545 A157162 * A089299 A017910 A240734 Adjacent sequences:  A109431 A109432 A109433 * A109435 A109436 A109437 KEYWORD base,nonn,tabf AUTHOR Robert G. Wilson v, Jun 28 2005 EXTENSIONS New definition from R. J. Mathar, Nov 27 2007 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
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified April 17 08:40 EDT 2021. Contains 343064 sequences. (Running on oeis4.)