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A138841 Concatenation of initial and final digit of n-th Mersenne prime A000668(n). 8
33, 77, 31, 17, 81, 11, 57, 27, 21, 61, 17, 17, 61, 57, 17, 17, 41, 21, 11, 27, 41, 31, 21, 41, 41, 41, 81, 57, 57, 51, 77, 17, 11, 47, 81, 61, 11, 41, 91, 17, 27, 17, 31, 11, 27, 11, 31 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..47.

FORMULA

a(n) = A073729(A000668(n)). - Michel Marcus, Apr 17 2018

EXAMPLE

a(5)=81 because the 5th Mersenne prime is 8191, A000668(5)=8191.

CROSSREFS

Cf. A000668, A073729, A080172, A135613, A138840, A138842, A138843.

Sequence in context: A049012 A137187 A134037 * A248979 A246409 A211837

Adjacent sequences:  A138838 A138839 A138840 * A138842 A138843 A138844

KEYWORD

base,nonn,more,less

AUTHOR

Omar E. Pol, Apr 01 2008

EXTENSIONS

a(40)-a(47) from Ivan Panchenko, Apr 17 2018

STATUS

approved

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Last modified May 17 22:15 EDT 2021. Contains 343992 sequences. (Running on oeis4.)