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A115687 Powerful(1) numbers (A001694) whose digit reversal is a semiprime (A001358). 2
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified February 28 01:38 EST 2020. Contains 332319 sequences. (Running on oeis4.)