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A122261 Characteristic function of numbers having only factors that are Pierpont primes. 3
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(n) = if n=1 then 0 else A122262(n) - A122262(n-1);

a(A122260(n)) = 1;

a(n) = A122255(n) for n < 25.

LINKS

Table of n, a(n) for n=1..105.

Index entries for characteristic functions

Eric Weisstein's World of Mathematics, Pierpont Prime

FORMULA

Multiplicative with a(p) = A010051(p) * A065333(p-1), p prime.

CROSSREFS

Sequence in context: A086299 A152066 A122255 * A014922 A014988 A015076

Adjacent sequences:  A122258 A122259 A122260 * A122262 A122263 A122264

KEYWORD

nonn,mult

AUTHOR

Reinhard Zumkeller, Aug 29 2006

STATUS

approved

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Last modified June 28 16:56 EDT 2017. Contains 288839 sequences.