cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A076443 Even-digit palindromic perfect powers.

Original entry on oeis.org

1331, 698896, 1003003001, 637832238736, 1000030000300001, 1033394994933301, 1331399339931331, 4099923883299904, 1000000300000030000001, 1003303931991393033001, 1030331909339091330301, 1331003993003993001331, 6916103777337773016196
Offset: 1

Views

Author

Robert G. Wilson v, Oct 12 2002

Keywords

Examples

			a(1) = 11^3; a(2) = (4*11*19)^2; a(3) = (7*11*13)^3; a(4) = (4*7*11*2593)^2; a(5) = (11*9091)^3, a(6) = (7*11*13*101)^3, a(7) = (11*73*137)^3, etc.
		

Crossrefs

Programs

  • Mathematica
    a = {}; Do[ q = IntegerDigits[n]; p = FromDigits[ Join[q, Reverse[q]]]; If[ Apply[ GCD, Last[ Transpose[ FactorInteger[p]]]] > 1, a = Append[a, p]; Print[p]], {n, 1, 4000000}]

Extensions

a(8)-a(13) from Donovan Johnson, Oct 03 2011