A115687 Powerful(1) numbers (A001694) whose digit reversal is a semiprime (A001358).

4, 9, 49, 64, 121, 169, 289, 400, 512, 625, 900, 961, 968, 1156, 1225, 1568, 1849, 2048, 2401, 2888, 3125, 3136, 3364, 3481, 3721, 4000, 4900, 4913, 5041, 5329, 5408, 6400, 6859, 6889, 7396, 8192, 8575, 9000, 9604, 10201, 10648, 10816, 10952

Offset

1,1

Links

Table of n, a(n) for n=1..43.

Index entries for sequences related to powerful numbers

Example

968=2^3*11^2 is powerful and 869=11*79 is semiprime.

Crossrefs

Cf. A001358, A001694, A115688.

Sequence in context: A164839 A225885 A247267 * A115711 A029791 A053961

Adjacent sequences: A115684 A115685 A115686 * A115688 A115689 A115690

Keyword

nonn,base

Author

Giovanni Resta, Jan 31 2006

Status

approved