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A077648 Initial digits of prime numbers. 14
2, 3, 5, 7, 1, 1, 1, 1, 2, 2, 3, 3, 4, 4, 4, 5, 5, 6, 6, 7, 7, 7, 8, 8, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
a(n) = A000030(A000040(n)).
MATHEMATICA
Table[First[IntegerDigits[Prime[n]]], {n, 1, 120}]
PROG
(Magma) [Intseq(p)[#Intseq(p)]: p in PrimesUpTo(600)]; // Bruno Berselli, Feb 14 2013
(PARI) a(n) = digits(prime(n))[1]; \\ Michel Marcus, Feb 11 2017
CROSSREFS
Sequence in context: A230200 A113493 A060420 * A033308 A134690 A295868
KEYWORD
base,nonn
AUTHOR
Labos Elemer, Nov 19 2002
STATUS
approved

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Last modified March 28 11:46 EDT 2024. Contains 371241 sequences. (Running on oeis4.)