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A045968 a(1)=5; for n >= 2, if n = Product p_i^e_i, then a(n) = Product p_{i+3}^e_i. 3
5, 7, 11, 49, 13, 77, 17, 343, 121, 91, 19, 539, 23, 119, 143, 2401, 29, 847, 31, 637, 187, 133, 37, 3773, 169, 161, 1331, 833, 41, 1001, 43, 16807, 209, 203, 221, 5929, 47, 217, 253, 4459, 53, 1309, 59, 931, 1573, 259, 61, 26411, 289, 1183, 319, 1127, 67, 9317, 247 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

From a puzzle proposed by Marc LeBrun.

LINKS

Table of n, a(n) for n=1..55.

EXAMPLE

If n = 9 = 3^2, then a(n) = 11^2 = 121 (since 11 is the thiord prime after 3).

CROSSREFS

Sequence in context: A038976 A106714 A106819 * A066367 A098036 A127269

Adjacent sequences:  A045965 A045966 A045967 * A045969 A045970 A045971

KEYWORD

easy,nonn

AUTHOR

N. J. A. Sloane

EXTENSIONS

More terms from David W. Wilson

Erroneous linear recurrence deleted by Harvey P. Dale, May 07 2018

STATUS

approved

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Last modified February 24 13:13 EST 2021. Contains 341569 sequences. (Running on oeis4.)