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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).
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%I #6 Mar 11 2014 01:34:11

%S 2,3,6,4,7,28,16,31,496,64,127,8128,4096,8191,33550336,65536,131071,

%T 8589869056,262144,524287,137438691328,1073741824,2147483647,

%U 2305843008139952128,1152921504606846976,2305843009213693951

%N 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).

%H L. C. Noll, <a href="http://isthe.com/chongo/tech/math/prime/mersenne.html">Mersenne Prime Digits and Names</a>.

%H J. M. Pedersen, <a href="http://amicable.homepage.dk/perfect.htm">Known Perfect Numbers</a>.

%H Omar E. Pol, <a href="http://www.polprimos.com">Determinacion geometrica de los numeros primos y perfectos</a>.

%e Array begins:

%e 2, 3, 6

%e 4, 7, 28

%e 16, 31, 496

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

%K nonn,tabf

%O 1,1

%A _Omar E. Pol_, Apr 07 2008