The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A262631 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A262631

Minimal nested base-3 palindromic primes with seed 1.
(history; published version)

#13 by Bruno Berselli at Mon Oct 19 05:10:29 EDT 2015

STATUS

proposed

approved

#12 by Michel Marcus at Mon Oct 19 04:48:46 EDT 2015

STATUS

editing

proposed

#11 by Michel Marcus at Mon Oct 19 04:48:27 EDT 2015

EXAMPLE

1

111

1111111

22111111122

1221111111221

112211111112211

STATUS

proposed

editing

#10 by Clark Kimberling at Sun Oct 18 09:07:14 EDT 2015

STATUS

editing

proposed

#9 by Clark Kimberling at Sun Oct 18 09:07:00 EDT 2015

EXAMPLE

1221111111221

STATUS

reviewed

editing

#8 by R. J. Mathar at Sat Oct 17 18:05:45 EDT 2015

STATUS

proposed

reviewed

#7 by R. J. Mathar at Sat Oct 17 18:05:40 EDT 2015

STATUS

editing

proposed

#6 by R. J. Mathar at Sat Oct 17 18:05:14 EDT 2015

NAME

Minimal nested base-3 palindromic base-3 primes with seed 1; see Comments.

COMMENTS

Using only base-3 digits 0,1,2, let s be a palindrome and put a(1) = s. Let a(2) be the least palindromic prime having s in the middle; for n > 2, let a(n) be the least palindromic prime have a(n-1) in the middle. Then (a(n)) is the sequence of minimal nested base-3 palindromic base-3 primes with seed s.

CROSSREFS

Cf. A261881 (base 10), A262632, A262627. Subset of A117698 (except a(1)).

KEYWORD

nonn,easy,base,changed

STATUS

proposed

editing

#5 by Jon E. Schoenfield at Sat Oct 03 16:01:12 EDT 2015

STATUS

editing

proposed

#4 by Jon E. Schoenfield at Sat Oct 03 16:01:09 EDT 2015

COMMENTS

EXAMPLE

a(4) = 22111111122 is the least base-3 prime having a(3) = 1111111 in its middle. Triangular format:

1221111111221

STATUS

proposed

editing