A091314 Primes in A038397 (concatenate first n squares in reverse order).

41, 941, 196169144121100816449362516941

Offset: 1

Author

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

Keywords

• nonn
• bref
• base
• less

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

• M. Fleuren, Smarandache Back Concatenated Squares.

Crossrefs

Cf. A038397.