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A132943 Concatenation of first n imperfect numbers. 2
1, 12, 123, 1234, 12345, 123457, 1234578, 12345789, 1234578910, 123457891011, 12345789101112, 1234578910111213, 123457891011121314, 12345789101112131415, 1234578910111213141516, 123457891011121314151617 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..16.

Omar E. Pol, Determinacion geometrica de los numeros primos y perfectos.

CROSSREFS

Imperfect numbers: A132999. Cf. A000396, A007908, A019518, A132928.

Sequence in context: A057932 A262578 A262577 * A262576 A262575 A187871

Adjacent sequences:  A132940 A132941 A132942 * A132944 A132945 A132946

KEYWORD

easy,nonn,base

AUTHOR

Omar E. Pol, Oct 16 2007

STATUS

approved

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Last modified April 9 20:55 EDT 2020. Contains 333363 sequences. (Running on oeis4.)