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A135613
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Initial digit of Mersenne primes A000668.
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5
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3, 7, 3, 1, 8, 1, 5, 2, 2, 6, 1, 1, 6, 5, 1, 1, 4, 2, 1, 2, 4, 3, 2, 4, 4, 4, 8, 5, 5, 5, 7, 1, 1, 4, 8, 6, 1, 4, 9
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| Landon Curt Noll, Mersenne Prime Digits and Names.
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EXAMPLE
| a(4)=1 because the 4th Mersenne prime A000668(4) is 127 and the initial digit of 127 is 1.
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MATHEMATICA
| lst = {* the list of terms in A000043 *}; f[n_] := Block[{pn = 2^n - 1}, Quotient[pn, 10^Floor[ Log[10, pn]] ]]; f@# & /@ lst - Robert G. Wilson v, (rgwv(AT)rgwv.com), Apr 01 2008
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CROSSREFS
| Cf. A000030, A000668, A077648, A080172.
Sequence in context: A153027 A161127 A021272 * A019973 A010623 A066065
Adjacent sequences: A135610 A135611 A135612 * A135614 A135615 A135616
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KEYWORD
| nonn,base
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Mar 01 2008
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EXTENSIONS
| More terms from Robert G. Wilson v, (rgwv(AT)rgwv.com), Apr 01 2008
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