A228355 Write the primes backwards in base 10 and juxtapose their digits.

2, 3, 5, 7, 1, 1, 3, 1, 7, 1, 9, 1, 3, 2, 9, 2, 1, 3, 7, 3, 1, 4, 3, 4, 7, 4, 3, 5, 9, 5, 1, 6, 7, 6, 1, 7, 3, 7, 9, 7, 3, 8, 9, 8, 7, 9, 1, 0, 1, 3, 0, 1, 7, 0, 1, 9, 0, 1, 3, 1, 1, 7, 2, 1, 1, 3, 1, 7, 3, 1, 9, 3, 1, 9, 4, 1, 1, 5, 1, 7, 5, 1, 3, 6, 1, 7, 6

Offset: 0

Author

Vincenzo Librandi, Aug 21 2013

Keywords

• nonn
• base
• cons

Comments

Also, decimal expansion of the constant 0.235711317191329213731434743595...

The same sequence, but with different indexing, would arise for the table whose n-th row lists the A097944(n) digits of the n-th prime A000040(n) from right to left. - M. F. Hasler, Oct 24 2019

Links

• Vincenzo Librandi, Table of n, a(n) for n = 0..2000

Crossrefs

Cf. A004087, A007376, A033308.

Programs

Mathematica

Reverse[IntegerDigits//@ Reverse@Prime@Range@50//Flatten]

PARI

fromdigits( A=concat(apply( row(n)=Vecrev(digits(prime(n))), [1..default(realprecision)])))*.1^#A \\ Result = the constant, A = sequence of digits, row(n) = n-th row of the table. - M. F. Hasler, Oct 24 2019