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A100896
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a(n) has decimal expansion 3nn3.
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5
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3003, 3113, 3223, 3333, 3443, 3553, 3663, 3773, 3883, 3993, 310103, 311113, 312123, 313133, 314143, 315153, 316163, 317173, 318183, 319193, 320203, 321213, 322223, 323233, 324243, 325253, 326263, 327273, 328283, 329293, 330303, 331313, 332323
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OFFSET
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0,1
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LINKS
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Robert Israel, Table of n, a(n) for n = 0..10000
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FORMULA
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a(n) = 3nn3 where n=0, 1, 2, 3, ...
a(n) = 3*(1+10^(2*d+1))+n*(10+10^(d+1)) where d = A055642(n). - Robert Israel, Mar 08 2018
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EXAMPLE
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If n=5, then 3nn3 is 3553.
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MAPLE
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f:= proc(n) local d; d:= ilog10(n)+1; 3*(1+10^(2*d+1))+n*(10+10^(d+1)) end proc:
3003, seq(f(n), n=1..100); # Robert Israel, Mar 08 2018
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MATHEMATICA
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FromDigits/@Table[Join[{3}, IntegerDigits[i], IntegerDigits[i], {3}], {i, 0, 40}] (* Harvey P. Dale, Sep 22 2014 *)
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PROG
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(Magma) [3003] cat [3*(1+10^(2*#Intseq(n)+1))+n*(10+10^(#Intseq(n)+1)): n in [1..40]]; // Vincenzo Librandi, Mar 09 2018
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CROSSREFS
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Cf. A100846.
Sequence in context: A128935 A145304 A094336 * A324405 A140915 A140928
Adjacent sequences: A100893 A100894 A100895 * A100897 A100898 A100899
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KEYWORD
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nonn,base,easy
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AUTHOR
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Parthasarathy Nambi, Jan 10 2005
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EXTENSIONS
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More terms from Brian Lauer (bel136(AT)psu.edu), Feb 21 2006
Offset changed to 0 by Robert Israel, Mar 08 2018
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STATUS
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approved
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