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Search: id:A154506
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| A154506 |
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If the decimal number "A141468(n) followed by n" is prime, adjoin it to sequence. |
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+0
1
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| 43, 107, 149, 2719, 3323, 5641, 5843, 7253, 7757, 8059, 8563, 9067, 12697, 182141, 188147, 224177, 279221, 298237, 300239, 315251, 350281, 360289, 362291, 371299, 388313, 412333, 418339, 424343, 448363, 453367, 460373, 469379, 473383, 549449, 558457
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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43 is a member since 43 is a prime and A141468(3)=4.
107 is a member since 107 is a prime and A141468(7)=10.
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MAPLE
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# (Maple program from N. J. A. Sloane, Jun 27 2009): read transforms; read bfile for A141486 (giving list b1); then:
t0:=[];
for n from 2 to nops(b1) do
t1:=cat(b1[n], n);
t2:=stoint(t1);
if isprime(t2) then t0:=[op(t0), t2]; fi;
od:
t0;
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CROSSREFS
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Cf. A141468.
Sequence in context: A142795 A023293 A115606 this_sequence A044230 A044611 A142944
Adjacent sequences: A154503 A154504 A154505 this_sequence A154507 A154508 A154509
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KEYWORD
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nonn,base
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AUTHOR
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Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Jan 11 2009
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EXTENSIONS
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Edited and extended from a(13) onwards by N. J. A. Sloane, Jun 26 2009
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