**a(n) is the concatenation of the numbers appearing in row n of the lexicographically earliest prime pyramid (A051237).**

*1, 12, 123, 1234, 14325, 143256, 1432567, 12347658, 123476589, 12347658910*

*5 seqfan posts*

*Wed Mar 16 18:01:42 CET 2011* [seqfan] Re: A187871

*Tue Mar 15 18:12:57 CET 2011* [seqfan] Re: A187871

*Tue Mar 15 17:32:43 CET 2011* [seqfan] Re: put the numbers from 1 to n such the sum of two of them are prime

*Mon Mar 14 17:08:23 CET 2011* [seqfan] Re: put the numbers from 1 to n such the sum of two of them are prime

*Mon Mar 14 16:28:56 CET 2011* [seqfan] Re: put the numbers from 1 to n such the sum of two of them are prime

Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword

Links to OEIS content are included according to
The OEIS End-User License Agreement
.