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A236515 Colexicographic index of prime signature of n. 1
1, 2, 2, 3, 2, 4, 2, 5, 3, 4, 2, 6, 2, 4, 4, 8, 2, 5, 2, 6, 4, 4, 2, 9, 3, 4, 5, 6, 2, 7, 2, 13, 4, 4, 4, 10, 2, 4, 4, 9, 2, 7, 2, 6, 6, 4, 2, 14, 3, 5, 4, 6, 2, 8, 4, 9, 4, 4, 2, 11, 2, 4, 6, 20, 4, 7, 2, 6, 4, 7, 2, 15, 2, 4, 5, 6, 4, 7, 2, 14, 8, 4, 2, 11, 4, 4, 4, 9, 2, 10, 4, 6, 4, 4, 4, 21, 2, 5, 6, 10 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Index of prime signature of n when prime signatures are listed in colexicographic order (see A036037).

LINKS

Table of n, a(n) for n=1..100.

OEIS Wiki, Orderings of prime signature

EXAMPLE

a(7) = a({1}) = 2, a(180) = a({2,2,1}) = 17, a(216) = a({3,3}) = 23

=====================================================================

a(1) = 1,

For all n in A000040, prime_signature(n) = {1}, a(n) = 2,

For all n in A001248, prime_signature(n) = {2}, a(n) = 3,

For all n in A006881, prime_signature(n) = {1,1}, a(n) = 4,

For all n in A030078, prime_signature(n) = {3}, a(n) = 5,

For all n in A054753, prime_signature(n) = {2,1}, a(n) = 6,

For all n in A007304, prime_signature(n) = {1,1,1}, a(n) = 7, etc.

CROSSREFS

Cf. A036037, A124010, A237433.

Sequence in context: A300250 A319357 A237433 * A318469 A300224 A304103

Adjacent sequences:  A236512 A236513 A236514 * A236516 A236517 A236518

KEYWORD

nonn

AUTHOR

Sung-Hyuk Cha, Jan 27 2014

STATUS

approved

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Last modified March 4 04:39 EST 2021. Contains 341779 sequences. (Running on oeis4.)