cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-2 of 2 results.

A138833 Concatenation of n-th perfect number and n-th Mersenne prime A000668(n).

Original entry on oeis.org

63, 287, 49631, 8128127, 335503368191, 8589869056131071, 137438691328524287, 23058430081399521282147483647, 26584559915698317446546926159538421762305843009213693951, 191561942608236107294793378084303638130997321548169216618970019642690137449562111
Offset: 1

Views

Author

Omar E. Pol, Apr 06 2008

Keywords

Comments

a(15) has 1156 digits. - Harvey P. Dale, Jan 10 2023

Examples

			a(3)=49631 because A000396(3)=496 and A000668(3)=31.

Links

Crossrefs

Cf. A000396, A000668, A138816, A138817, A138818, A138819, A138820, A138821, A138822, A138832.

Programs

  • Mathematica
    Module[{nn=10},FromDigits[Flatten[IntegerDigits/@#]]&/@Thread[{PerfectNumber[ Range[ nn]],2^ MersennePrimeExponent[ Range[nn]]-1}]] (* Harvey P. Dale, Jan 10 2023 *)

Extensions

Corrected and extended by Harvey P. Dale, Jan 10 2023

A138832 Concatenation of n-th Mersenne prime A000668(n) and n-th perfect number.

Original entry on oeis.org

36, 728, 31496, 1278128, 819133550336, 1310718589869056, 524287137438691328, 21474836472305843008139952128, 23058430092136939512658455991569831744654692615953842176
Offset: 1

Views

Author

Omar E. Pol, Apr 06 2008

Keywords

Examples

			a(3)=31496 because A000668(3)=31 and A000396(3)=496.

Crossrefs

Cf. A000396, A000668, A138816, A138817, A138818, A138819, A138820, A138821, A138822, A138833.
Showing 1-2 of 2 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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