A132943 - OEIS

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A132943

Concatenation of first n imperfect numbers.

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 A362119 A262575

Adjacent sequences: A132940 A132941 A132942 * A132944 A132945 A132946

KEYWORD

easy,nonn,base

AUTHOR

Omar E. Pol, Oct 16 2007

STATUS

approved