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A048847 Primes formed by concatenation of first k odd numbers. 5
13, 135791113151719, 135791113151719212325272931, 135791113151719212325272931333537394143454749515355575961636567 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The next term (a(5)) has 93 digits. - Harvey P. Dale, Mar 05 2013

a(6) has 9725 digits (see A066811(6) or A046036(6)). - Michel Marcus, Jan 31 2014

REFERENCES

R. W. Stephan, Factors and Primes in Two Smarandache Sequences, Smarandache Notions Journal, second edition, Vol. 9, No. 1-2, 1998, 5-11.

LINKS

Table of n, a(n) for n=1..4.

M. Fleuren, Smarandache Concatenated Odds.

Eric Weisstein's World of Mathematics, Consecutive Number Sequences

MATHEMATICA

Select[Table[FromDigits[Flatten[IntegerDigits/@Range[1, 2n+1, 2]]], {n, 40}], PrimeQ] (* Harvey P. Dale, Mar 05 2013 *)

CROSSREFS

Cf. A019519, A046036.

Sequence in context: A081509 A177224 A145234 * A093671 A257137 A134070

Adjacent sequences:  A048844 A048845 A048846 * A048848 A048849 A048850

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane, Charles T. Le (charlestle(AT)yahoo.com)

EXTENSIONS

Edited by Charles R Greathouse IV, Apr 23 2010

STATUS

approved

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Last modified April 22 10:36 EDT 2019. Contains 322330 sequences. (Running on oeis4.)