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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

Table of n, a(n) for n=1..51.

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 * A143665 A074479 A272043

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

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Last modified October 19 19:55 EDT 2018. Contains 316378 sequences. (Running on oeis4.)