The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A087352

(Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing all changes.

A087352

a(n+1) is the smallest square > a(n) such that every concatenation (n > 1) is a prime.
(history; published version)

#4 by N. J. A. Sloane at Thu Dec 05 19:56:21 EST 2013

AUTHOR

_Amarnath Murthy (amarnath_murthy(AT)yahoo.com), _, Sep 08 2003

Discussion

Thu Dec 05

19:56

OEIS Server: https://oeis.org/edit/global/2075

#3 by Russ Cox at Sat Mar 31 13:20:50 EDT 2012

EXTENSIONS

More terms from _David Wasserman (wasserma(AT)spawar.navy.mil), _, May 10 2005

Discussion

Sat Mar 31

13:20

OEIS Server: https://oeis.org/edit/global/880

#2 by N. J. A. Sloane at Tue Jul 19 03:00:00 EDT 2005

NAME

a(n+1)= 1, then is the smallest square > a(n) such that every concatenation (n > 1) is a prime.

DATA

1, 9, 49, 81, 441, 729, 15129, 33489, 35721, 127449, 184041, 288369, 505521, 594441, 1046529, 4004001, 4941729, 8415801, 14130081, 19474569, 20820969, 21427641, 25070049, 31236921, 33419961, 37197801, 57471561, 58201641, 58844241

OFFSET

0,1,2

KEYWORD

base,more,nonn,new

EXTENSIONS

More terms from David Wasserman (wasserma(AT)spawar.navy.mil), May 10 2005

#1 by N. J. A. Sloane at Sat Sep 13 03:00:00 EDT 2003

NAME

a(1)= 1, then smallest square such that every concatenation (n> 1) is a prime.

DATA

1, 9, 49, 81, 441

OFFSET

0,2

EXAMPLE

19, 1949, 194981, 194981441 are all primes.

CROSSREFS

Cf. A087353.

KEYWORD

base,more,nonn,new

AUTHOR

Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 08 2003

STATUS

approved