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A138728 Array read by rows: row n lists n-th even superperfect number A061652(n), n-th Mersenne prime A000668(n) and n-th perfect number A000396(n). 0
2, 3, 6, 4, 7, 28, 16, 31, 496, 64, 127, 8128, 4096, 8191, 33550336, 65536, 131071, 8589869056, 262144, 524287, 137438691328, 1073741824, 2147483647, 2305843008139952128, 1152921504606846976, 2305843009213693951 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..26.

L. C. Noll, Mersenne Prime Digits and Names.

J. M. Pedersen, Known Perfect Numbers.

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

EXAMPLE

Array begins:

2, 3, 6

4, 7, 28

16, 31, 496

CROSSREFS

Cf. A000396, A000668, A019279, A061652, A138818, A138819.

Sequence in context: A273338 A099900 A193903 * A291604 A082332 A154285

Adjacent sequences:  A138725 A138726 A138727 * A138729 A138730 A138731

KEYWORD

nonn,tabf

AUTHOR

Omar E. Pol, Apr 07 2008

STATUS

approved

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Last modified February 25 23:44 EST 2020. Contains 332270 sequences. (Running on oeis4.)