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A047987 Integers n such that A047988(n)=4. 3
3976733, 8053483, 9942523, 10197427, 15126557, 28623773, 32269037, 34438387, 36627413, 39593803, 47812747, 49120843, 55066867, 69909667, 78068443, 80024213, 83402597, 89512483, 97799033, 101652883, 106675637, 116621213, 120317683, 128241067 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

Thomas Kantke, Mathematische Unterhaltungen, Spectrum der Wissenschaft, April 1993, pp. 11-13.

LINKS

Table of n, a(n) for n=1..24.

CROSSREFS

Cf. A047836, A047984-A047988.

Sequence in context: A115171 A144642 A032753 * A234798 A290123 A146946

Adjacent sequences:  A047984 A047985 A047986 * A047988 A047989 A047990

KEYWORD

nonn

AUTHOR

Thomas Kantke (bytes.more(AT)ibm.net)

EXTENSIONS

More terms from Max Alekseyev, Jun 13 2011

STATUS

approved

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Last modified June 16 10:03 EDT 2019. Contains 324152 sequences. (Running on oeis4.)