This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A114009 Regular triangle where n-th row is composed of n primes beginning with prime(n). 1
 2, 3, 31, 5, 53, 59, 7, 71, 73, 79, 11, 113, 1103, 1109, 1117, 13, 131, 137, 139, 1301, 1303, 17, 173, 179, 1709, 1721, 1723, 1733, 19, 191, 193, 197, 199, 1901, 1907, 1913, 23, 233, 239, 2309, 2311, 2333, 2339, 2341, 2347, 29, 293, 2903, 2909, 2917, 2927 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE One prime beginning with 2, followed by the two primes 3, 31 beginning with 3. MATHEMATICA f[n_] := Block[{c = 0, t = {}, p = Prime[n]}, k = PrimePi[p]; lng = Ceiling[Log[10, p]]; While[c < n, q = Prime[k]; If[p == FromDigits@Take[IntegerDigits@q, lng], c++; AppendTo[t, q]]; k++ ]; t]; Array[f, 10] // Flatten (* Robert G. Wilson v *) CROSSREFS Cf. A000040 (first column). Sequence in context: A048986 A093712 A035514 * A307453 A143665 A074479 Adjacent sequences:  A114006 A114007 A114008 * A114010 A114011 A114012 KEYWORD base,nonn,tabl AUTHOR Amarnath Murthy, Nov 12 2005 EXTENSIONS More terms from Robert G. Wilson v, Nov 17 2005 Name clarified Michel Marcus, Sep 16 2013 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 June 20 11:38 EDT 2019. Contains 324234 sequences. (Running on oeis4.)