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A038693 Numbers n such that concatenation of prime factors is a perfect square. 0
10, 20, 183, 145, 178, 203, 802, 1131, 1202, 1618, 2810, 2867, 3218, 3983, 4645, 4939, 5602, 6989, 9023, 9298, 9407, 9691, 10562, 12205, 13138, 14907, 16739, 16805, 18482, 19443, 19858, 21445, 26941, 28803, 35605, 35689, 40405, 43243 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..38.

EXAMPLE

802=2*401 and 2401=49^2. 1131=3*13*29 and 31329=177^2.

CROSSREFS

Sequence in context: A006993 A250107 A217318 * A239237 A018990 A280882

Adjacent sequences:  A038690 A038691 A038692 * A038694 A038695 A038696

KEYWORD

nonn,base

AUTHOR

Jeff Burch

STATUS

approved

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Last modified November 20 00:42 EST 2017. Contains 294957 sequences.