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 A167417 Largest prime concatenation of the first n primes. 1
 2, 23, 523, 7523, 751123, 71151323, 7115117323, 711913152317, 71231915117323 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Sequence is finite (9 terms only), because sum of first 10 primes: 2+3+5+7+11+13+17+19+23+29 = 3 * 43 REFERENCES A. Weil, Number theory: an approach through history, BirkhĂ¤user 1984. Richard E. Crandall, Carl Pomerance, Prime Numbers, Springer 2005. Paulo Ribenboim, The New Book of Prime Number Records, Springer 1996. LINKS EXAMPLE (1) for a(1)=2, a(2)=23, a(3)=523 no other possibility; (2) for calculating a(4) the 4th prime 7 is to concatenate: 5237, 5273, 7523 are prime (but 5723=59 * 97) => largest is a(4) = 7523; (3) a(6) is not formed of 6th prime 13 and a(5)=751123 but from 711523 and 13. CROSSREFS Sequence in context: A053160 A167416 A053066 * A053161 A090731 A090314 Adjacent sequences:  A167414 A167415 A167416 * A167418 A167419 A167420 KEYWORD fini,nonn,full,base AUTHOR Eva-Maria Zschorn (e-m.zschorn(AT)zaschendorf.km3.de), Nov 03 2009 EXTENSIONS Edited by Charles R Greathouse IV, Apr 28 2010 STATUS approved

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Last modified April 10 22:05 EDT 2021. Contains 342856 sequences. (Running on oeis4.)