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A138877 Concatenation of first 3 digits and last 3 digits of n-th perfect number. 3
66, 2828, 496496, 812128, 335336, 858056, 137328, 230128, 265176, 191216, 131128, 144128, 235976, 141128, 541328, 108528, 994776, 335056, 182536, 407528, 114216, 598576, 395336, 931656, 100376, 811816, 365456, 144528, 136528, 131016, 278128 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..31.

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

Jan Munch Pedersen, Known Perfect Numbers [From Steven Bi (chenhsi(AT)stanford.edu), Jan 13 2009]

CROSSREFS

Cf. A000396, A104511, A138843, A138866.

Sequence in context: A004365 A062152 A138875 * A265454 A004998 A239409

Adjacent sequences:  A138874 A138875 A138876 * A138878 A138879 A138880

KEYWORD

base,nonn

AUTHOR

Omar E. Pol, Apr 02 2008

EXTENSIONS

Added terms 15-33 and corrected 1 term Steven Bi (chenhsi(AT)stanford.edu), Jan 13 2009

STATUS

approved

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Last modified May 31 16:29 EDT 2020. Contains 334748 sequences. (Running on oeis4.)