A068137 Smallest prime beginning and ending symmetrically with concatenation of first n natural numbers. Need not be a palindrome.

11, 12421, 1235321, 123424321, 12345254321, 1234562654321, 123456737654321, 12345678487654321, 1234567894987654321, 1234567891010987654321, 1234567891011111110987654321, 12345678910111229121110987654321

Offset

1,1

Links

Table of n, a(n) for n=1..12.

Crossrefs

Cf. A068135.

Sequence in context: A180561 A185538 A125545 * A220979 A125546 A061965

Adjacent sequences: A068134 A068135 A068136 * A068138 A068139 A068140

Keyword

base,nonn

Author

Amarnath Murthy, Feb 22 2002

Extensions

More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 07 2003

Status

approved