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).

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

Offset: 1

Author

Omar E. Pol, Apr 07 2008

Keywords

• nonn
• tabf

Examples

			Array begins:
2, 3, 6
4, 7, 28
16, 31, 496
		

Links

• 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.

Crossrefs

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