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A091314 Primes in A038397 (concatenate first n squares in reverse order). 12
41, 941, 196169144121100816449362516941 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Among the first 51 terms only three terms are prime: SmBackConSq(2), SmBackConSq(3), SmBackConSq(14), found by Micha Fleuren.

The next term a(4) is formed from concatenation of square of numbers from 700 to 1 and consists of 3742 digits. - Shyam Sunder Gupta, Jul 25 2013

Analogously, a(5) is probably the concatenation of squares up to 2818^2, which is a probable prime of 18269 digits, while a(6) > 10^40000. - Giovanni Resta, Jul 22 2013

LINKS

Table of n, a(n) for n=1..3.

M. Fleuren, Smarandache Back Concatenated Squares.

CROSSREFS

Cf. A038397.

Sequence in context: A177418 A038397 A104349 * A059762 A069362 A016093

Adjacent sequences:  A091311 A091312 A091313 * A091315 A091316 A091317

KEYWORD

nonn,bref,base,less

AUTHOR

M. Grete (martha.grete(AT)web.de), Feb 21 2004

STATUS

approved

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Last modified August 19 05:01 EDT 2019. Contains 326109 sequences. (Running on oeis4.)