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A038692 Square numbers that are concatenations of two or more prime numbers. 4
25, 225, 289, 361, 529, 729, 2401, 2601, 2809, 4761, 5329, 5929, 7225, 7569, 11449, 11881, 13225, 15129, 19881, 21609, 22801, 23409, 24649, 25281, 26569, 27225, 29241, 29929, 31329, 32761, 34969, 36481, 39601, 47961, 52441, 53361, 54289, 55225, 57121, 58081 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..40.

FORMULA

A038692(n)=A166503(n)^2. As a set, A038692 = A000290 intersection A152242 = A016754 intersection A152242.  - M. F. Hasler, Mar 19 2012

PROG

(PARI) forstep(n=1, 300, 2, is_A152242(n^2) & print1(n^2", "))  \\ - M. F. Hasler, Mar 19 2012

CROSSREFS

Cf. A166503 (the square roots).

Sequence in context: A045785 A030484 A225135 * A017330 A135509 A295015

Adjacent sequences:  A038689 A038690 A038691 * A038693 A038694 A038695

KEYWORD

nonn,base

AUTHOR

Jeff Burch

EXTENSIONS

Edited by N. J. A. Sloane, Oct 18 2009, incorporating corrections from M. F. Hasler and Zak Seidov.

STATUS

approved

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Last modified November 20 04:05 EST 2017. Contains 294959 sequences.