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A138816 Concatenation of initial digit of n-th Mersenne prime A000668(n), initial digit of n-th even superperfect number A061652(n) and initial digit of n-th perfect number A000396(n). 6
326, 742, 314, 168, 843, 168, 521, 212, 212, 631, 181, 181, 632, 521, 155 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Also, concatenation of initial digit of n-th Mersenne prime A000668(n), initial digit of n-th superperfect number A019279(n) and initial digit of n-th perfect number A000396(n), if there are no odd superperfect numbers.
Also, concatenation of A135613(n), A138124(n) and A135617(n).
LINKS
CROSSREFS
Sequence in context: A358148 A031516 A066128 * A138817 A158271 A203723
KEYWORD
base,nonn,more
AUTHOR
Omar E. Pol, Apr 01 2008
EXTENSIONS
a(13)-a(15) from Robert Price, Jun 16 2019
STATUS
approved

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Last modified March 29 04:59 EDT 2024. Contains 371264 sequences. (Running on oeis4.)