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A138817 Concatenation of final digit of n-th Mersenne prime A000668(n), final digit of n-th even superperfect number A061652(n) and final digit of n-th perfect number A000396(n). 8
326, 748, 166, 748, 166, 166, 748, 748, 166, 166, 748, 748, 166, 748, 748, 748, 166, 166, 166, 748, 166, 166, 166, 166, 166, 166, 166, 748, 748, 166, 748, 748, 166, 748, 166, 166, 166, 166, 166 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Also, concatenation of final digit of n-th Mersenne prime A000668(n), final digit of n-th superperfect number A019279(n) and final digit of n-th perfect number A000396(n), if there are no odd superperfect numbers.

Also, concatenation of n-th term of A080172, A138125(n) and A094540(n).

a(1)=326. For n>1 a(n) is equal to 166 or 748, only.

LINKS

Table of n, a(n) for n=1..39.

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

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

CROSSREFS

Cf. A000396, A000668, A019279, A061652, A080172, A094540, A138125, A138817.

Sequence in context: A031516 A066128 A138816 * A158271 A203723 A097737

Adjacent sequences: A138814 A138815 A138816 * A138818 A138819 A138820

KEYWORD

base,nonn,less

AUTHOR

Omar E. Pol, Apr 01 2008

STATUS

approved

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Last modified November 30 09:21 EST 2022. Contains 358438 sequences. (Running on oeis4.)